顔写真

キス カズアキ
木須 一彰
Kazuaki Kisu
所属
金属材料研究所 物質創製研究部 水素機能材料工学研究部門
職名
助教
学位
  • 博士(工学)(東京農工大学)

  • 修士(工学)(東京農工大学)

e-Rad 研究者番号
80755645
Researcher ID

経歴 3

  • 2021年6月 ~ 継続中
    東北大学 金属材料研究所 助教

  • 2018年4月 ~ 2021年5月
    東北大学 材料科学高等研究所 助教

  • 2014年10月 ~ 2018年3月
    東京農工大学 特任助教

所属学協会 4

  • The Electrochemical Society

  • 日本イオン交換学会

  • 日本金属学会

  • 電気化学会

研究キーワード 3

  • 蓄電デバイス

  • 多価蓄電池

  • 電気化学

研究分野 2

  • ナノテク・材料 / 無機物質、無機材料化学 /

  • ナノテク・材料 / エネルギー化学 /

受賞 7

  1. 第63回原田研究奨励賞

    2023年5月 公益財団法人本多記念会

  2. 第21回インテリジェント・コスモス奨励賞

    2022年5月 インテリジェント・コスモス学術振興財団

  3. 材料科学世界トップレベル研究拠点奨励賞

    2022年2月 東北大学

  4. Best Poster Award

    2020年11月 The 3rd Symposium for The Core Research Clusters for Materials Science and Spintronics

  5. Best Poster Award

    2020年1月 14th International Symposium Hydrogen & Energy

  6. Young investigator of 2016 International Conference on Advanced Capacitors

    2016年6月 The Committee of Capacitor Technology

  7. Poster award of 2013 International Conference on Advanced Capacitors

    2013年6月 The Committee of Capacitor Technology

︎全件表示 ︎最初の5件までを表示

論文 33

  1. Stereolithography 3D Printed Carbon Microlattices with Hierarchical Porosity for Structural and Functional Applications

    Akira Kudo, Kazuya Kanamaru, Jiuhui Han, Rui Tang, Kazuaki Kisu, Takeharu Yoshii, Shin‐ichi Orimo, Hirotomo Nishihara, Mingwei Chen

    Small 2023年8月2日

    出版者・発行元:Wiley

    DOI: 10.1002/smll.202301525  

    ISSN:1613-6810

    eISSN:1613-6829

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    Abstract Hierarchically porous carbon microlattices (HPCMLs) fabricated by using a composite photoresin and stereolithography (SLA) 3D printing is reported. Containing magnesium oxide nanoparticles (MgO NPs) as porogens and multilayer graphene nanosheets as UV‐scattering inhibitors, the composite photoresin is formed to simple cubic microlattices with digitally designed porosity of 50%. After carbonization in vacuum at 1000 °C and chemical removal of MgO NPs, it is realized that carbon microlattices possessing hierarchical porosity are composed of the lattice architecture (≈100 µm), macropores (≈5 µm), mesopores (≈50 nm), and micropores (≈1 nm). The linear shrinkage after pyrolysis is as small as 33%. Compressive strength of 7.45 to 10.45 MPa and Young's modulus of 375 to 736 MPa are achieved, proving HPCMLs a robust mechanical component among reported carbon materials with a random pore structure. Having a few millimeters in thickness, the HPCMLs can serve as thick supercapacitor electrodes that demonstrate gravimetric capacitances 105 and 13.8 F g<sup>−1</sup> in aqueous and organic electrolyte, reaching footprint areal capacitances beyond 10 and 1 F cm<sup>−2</sup>, respectively. The results present that the composite photoresin for SLA can yield carbon microarchitectures that integrate structural and functional properties for structural energy storages .

  2. Explore the Ionic Conductivity Trends on B<sub>12</sub>H<sub>12</sub> Divalent <i>Closo</i>-Type Complex Hydride Electrolytes

    Egon Campos dos Santos, Ryuhei Sato, Kazuaki Kisu, Kartik Sau, Xue Jia, Fangling Yang, Shin-ichi Orimo, Hao Li

    Chemistry of Materials 35 (15) 5996-6004 2023年7月26日

    出版者・発行元:American Chemical Society (ACS)

    DOI: 10.1021/acs.chemmater.3c00975  

    ISSN:0897-4756

    eISSN:1520-5002

  3. Calcium Metal Batteries with Long Cycle Life Using a Hydride‐Based Electrolyte and Copper Sulfide Electrode 査読有り

    Kazuaki Kisu, Rana Mohtadi, Shin‐ichi Orimo

    Advanced Science 2023年5月19日

    出版者・発行元:Wiley

    DOI: 10.1002/advs.202301178  

    ISSN:2198-3844

    eISSN:2198-3844

  4. Topological Data analysis of Ion Migration Mechanism 査読有り

    Ryuhei Sato, Kazuto Akagi, Shigeyuki Takagi, Kartik Sau, Kazuaki Kisu, Hao Li, Shin-ichi Orimo

    The Journal of Chemical Physics 158 (14) 144116-144116 2023年4月14日

    出版者・発行元:AIP Publishing

    DOI: 10.1063/5.0143387  

    ISSN:0021-9606

    eISSN:1089-7690

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    Topological data analysis based on persistent homology has been applied to the molecular dynamics simulation for the fast ion-conducting phase ( α-phase) of AgI to show its effectiveness on the ion migration mechanism analysis. Time-averaged persistence diagrams of α-AgI, which quantitatively record the shape and size of the ring structures in the given atomic configurations, clearly showed the emergence of the four-membered rings formed by two Ag and two I ions at high temperatures. They were identified as common structures during the Ag ion migration. The averaged potential energy change due to the deformation of the four-membered ring during Ag migration agrees well with the activation energy calculated from the conductivity Arrhenius plot. The concerted motion of two Ag ions via the four-membered ring was also successfully extracted from molecular dynamics simulations by our approach, providing new insight into the specific mechanism of the concerted motion.

  5. The role of cation size in the ordered–disordered phase transition temperature and cation hopping mechanism based on LiCB<sub>11</sub>H<sub>12</sub> 査読有り

    Kartik Sau, Shigeyuki Takagi, Tamio Ikeshoji, Kazuaki Kisu, Ryuhei Sato, Shin-ichi Orimo

    Materials Advances 4 (10) 2269-2280 2023年3月

    出版者・発行元:Royal Society of Chemistry (RSC)

    DOI: 10.1039/d2ma00936f  

    eISSN:2633-5409

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    The ordered–disordered transition temperature is reduced significantly with increasing cationic sizes. A possible principle for creating better ion-conducting materials is to have smaller cations in a larger unit cell.

  6. A dynamic database of solid-state electrolyte (DDSE) picturing all-solid-state batteries

    Fangling Yang, Egon Campos dos Santos, Xue Jia, Ryuhei Sato, Kazuaki Kisu, Yusuke Hashimoto, Shin ichi Orimo, Hao Li

    Nano Materials Science 2023年

    DOI: 10.1016/j.nanoms.2023.08.002  

    ISSN:2096-6482

    eISSN:2589-9651

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    All-solid-state batteries (ASSBs) are a class of safer and higher-energy-density materials compared to conventional devices, from which solid-state electrolytes (SSEs) are their essential components. To date, investigations to search for high ion-conducting solid-state electrolytes have attracted broad concern. However, obtaining SSEs with high ionic conductivity is challenging due to the complex structural information and the less-explored structure-performance relationship. To provide a solution to these challenges, developing a database containing typical SSEs from available experimental reports would be a new avenue to understand the structure-performance relationships and find out new design guidelines for reasonable SSEs. Herein, a dynamic experimental database containing >600 materials was developed in a wide range of temperatures (132.40–1261.60 ​K), including mono- and divalent cations (e.g., Li+, Na+, K+, Ag+, Ca2+, Mg2+, and Zn2+) and various types of anions (e.g., halide, hydride, sulfide, and oxide). Data-mining was conducted to explore the relationships among different variates (e.g., transport ion, composition, activation energy, and conductivity). Overall, we expect that this database can provide essential guidelines for the design and development of high-performance SSEs in ASSB applications. This database is dynamically updated, which can be accessed via our open-source online system.

  7. Fast divalent conduction in MB<sub>12</sub>H<sub>12</sub>·12H<sub>2</sub>O (M = Zn, Mg) complex hydrides: effects of rapid crystal water exchange and application for solid-state electrolytes 査読有り

    Kazuaki Kisu, Arunkumar Dorai, Sangryun Kim, Riku Hamada, Akichika Kumatani, Yoshiko Horiguchi, Ryuhei Sato, Kartik Sau, Shigeyuki Takagi, Shin-ichi Orimo

    Journal of Materials Chemistry A 10 (46) 24877-24887 2022年12月

    出版者・発行元:Royal Society of Chemistry (RSC)

    DOI: 10.1039/d2ta06060d  

    ISSN:2050-7488

    eISSN:2050-7496

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    Water molecules are exchanged in the crystal structure, which imparts a high divalent conductivity to hydrated complex hydrides. MB<sub>12</sub>H<sub>12</sub>·12H<sub>2</sub>O (M = Zn or Mg) exhibits exceptional conductivities higher than those of less-hydrated complex hydrides.

  8. Ion Conductivity in a Magnesium Borohydride Ammonia Borane Solid-State Electrolyte 査読有り

    Mauro Palumbo, Kazuaki Kisu, Valerio Gulino, Carlo Nervi, Lorenzo Maschio, Silvia Casassa, Shin-ichi Orimo, Marcello Baricco

    The Journal of Physical Chemistry C 126 (36) 15118-15127 2022年9月15日

    出版者・発行元:American Chemical Society (ACS)

    DOI: 10.1021/acs.jpcc.2c04934  

    ISSN:1932-7447

    eISSN:1932-7455

  9. Increasing the ionic conductivity and lithium-ion transport of photo-cross-linked polymer with hexagonal arranged porous film hybrids 査読有り

    Manjit Singh Grewal, Kazuaki Kisu, Shin-ichi Orimo, Hiroshi Yabu

    iScience 25 (9) 104910-104910 2022年9月

    出版者・発行元:Elsevier BV

    DOI: 10.1016/j.isci.2022.104910  

    ISSN:2589-0042

  10. Metallic and complex hydride-based electrochemical storage of energy 査読有り

    Fermin Cuevas, Mads B Amdisen, Marcello Baricco, Craig E Buckley, Young Whan Cho, Petra de Jongh, Laura M de Kort, Jakob B Grinderslev, Valerio Gulino, Bjørn C Hauback, Michael Heere, Terry Humphries, Torben R Jensen, Sangryun Kim, Kazuaki Kisu, Young-Su Lee, Hai-Wen Li, Rana Mohtadi, Kasper T Møller, Peter Ngene, Dag Noréus, Shin-ichi Orimo, Mark Paskevicius, Marek Polanski, Sabrina Sartori, Lasse N Skov, Magnus H Sørby, Brandon C Wood, Volodymyr A Yartys, Min Zhu, Michel Latroche

    Progress in Energy 4 (3) 032001-032001 2022年7月1日

    出版者・発行元:IOP Publishing

    DOI: 10.1088/2516-1083/ac665b  

    eISSN:2516-1083

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    Abstract The development of efficient storage systems is one of the keys to the success of the energy transition. There are many ways to store energy, but among them, electrochemical storage is particularly valuable because it can store electrons produced by renewable energies with a very good efficiency. However, the solutions currently available on the market remain unsuitable in terms of storage capacity, recharging kinetics, durability, and cost. Technological breakthroughs are therefore expected to meet the growing need for energy storage. Within the framework of the Hydrogen Technology Collaboration Program—H<sub>2</sub>TCP Task-40, IEA’s expert researchers have developed innovative materials based on hydrides (metallic or complex) offering new solutions in the field of solid electrolytes and anodes for alkaline and ionic batteries. This review presents the state of the art of research in this field, from the most fundamental aspects to the applications in battery prototypes.

  11. Monocarborane cluster as a stable fluorine-free calcium battery electrolyte 査読有り

    Kazuaki Kisu, Sangryun Kim, Takara Shinohara, Kun Zhao, Andreas Züttel, Shin ichi Orimo

    Scientific Reports 11 (1) 2021年12月

    DOI: 10.1038/s41598-021-86938-0  

    eISSN:2045-2322

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    High-energy-density and low-cost calcium (Ca) batteries have been proposed as ‘beyond-Li-ion’ electrochemical energy storage devices. However, they have seen limited progress due to challenges associated with developing electrolytes showing reductive/oxidative stabilities and high ionic conductivities. This paper describes a calcium monocarborane cluster salt in a mixed solvent as a Ca-battery electrolyte with high anodic stability (up to 4 V vs. Ca /Ca), high ionic conductivity (4 mS cm ), and high Coulombic efficiency for Ca plating/stripping at room temperature. The developed electrolyte is a promising candidate for use in room-temperature rechargeable Ca batteries. 2+ −1

  12. Stabilization of superionic-conducting high-temperature phase of Li(CB9H10) via solid solution formation with Li2(B12H12) 査読有り

    Sangryun Kim, Kazuaki Kisu, Shin ichi Orimo

    Crystals 11 (4) 2021年4月

    DOI: 10.3390/cryst11040330  

    eISSN:2073-4352

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    We report the stabilization of the high-temperature (high-T) phase of lithium carba-closodecaborate, Li(CB H ), via the formation of solid solutions in a Li(CB H )-Li (B H ) quasi-binary system. Li(CB H )-based solid solutions in which [CB H ]- is replaced by [B H ] were obtained at compositions with low x values in the (1-x)Li(CB H )-xLi (B H ) system. An increase in the extent of [B H ] substitution promoted stabilization of the high-T phase of Li(CB H ), resulting in an increase in the lithium-ion conductivity. Superionic conductivities of over 10-3 S cm-1 were achieved for the compounds with 0.2 ≤ x ≤ 0.4. In addition, a comparison of the Li(CB H )-Li (B H ) system and the Li(CB H )-Li(CB11H12) system suggests that the valence of the complex anions plays an important role in the ionic conduction. In battery tests, an all-solid-state Li-TiS2 cell employing 0.6Li(CB H )-0.4Li (B H ) (x = 0.4) as a solid electrolyte presented reversible battery reactions during repeated discharge-charge cycles. The current study offers an insight into strategies to develop complex hydride solid electrolytes. 9 10 9 10 2 12 12 9 10 9 10 12 12 9 10 2 12 12 12 12 9 10 9 10 2 12 12 9 10 9 10 2 12 12 2- 2-

  13. Microstructural analyses of all-solid-state Li–S batteries using LiBH4-based solid electrolyte for prolonged cycle performance 査読有り

    Kazuaki Kisu, Sangryun Kim, Ryuga Yoshida, Hiroyuki Oguchi, Naoki Toyama, Shin ichi Orimo

    Journal of Energy Chemistry 50 424-429 2020年11月

    出版者・発行元:Elsevier BV

    DOI: 10.1016/j.jechem.2020.03.069  

    ISSN:2095-4956

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    Complex hydride materials have been widely investigated as potential solid electrolytes because they have good compatibility with the lithium metal anodes used in all-solid-state batteries. However, the development of all-solid-state batteries utilizing complex hydrides has been difficult as these cells tend to have short cycle lives. This study investigated the capacity fading mechanism of all-solid-state lithium–sulfur (Li–S) batteries using Li (BH ) I solid electrolytes by analyzing the cathode microstructure. Cross-sectional scanning electron microscopy observations after 100 discharge–charge cycles revealed crack formation in the Li (BH ) I electrolyte and an increased cathode thickness. Raman spectroscopy indicated that decomposition of the Li (BH ) I solid electrolyte occurred at a constant rate during the cycling tests. To combat these effects, the cycle life of Li–S batteries was improved by increasing the amount of solid electrolyte in the cathode. 4 4 3 4 4 3 4 4 3

  14. Unveiling Pseudocapacitive Charge Storage Behavior in FeWO4 Electrode Material by Operando X-Ray Absorption Spectroscopy 査読有り

    Nicolas Goubard-Bretesché, Olivier Crosnier, Camille Douard, Antonella Iadecola, Richard Retoux, Christophe Payen, Marie Liesse Doublet, Kazuaki Kisu, Etsuro Iwama, Katsuhiko Naoi, Frédéric Favier, Thierry Brousse

    Small 16 (33) 2002855-2002855 2020年8月1日

    DOI: 10.1002/smll.202002855  

    ISSN:1613-6810

    eISSN:1613-6829

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    In nanosized FeWO electrode material, both Fe and W metal cations are suspected to be involved in the fast and reversible Faradaic surface reactions giving rise to its pseudocapacitive signature. In order to fully understand the charge storage mechanism, a deeper insight into the involvement of the electroactive cations still has to be provided. The present paper illustrates how operando X-ray absorption spectroscopy is successfully used to collect data of unprecedented quality allowing to elucidate the complex electrochemical behavior of this multicationic pseudocapacitive material. Moreover, these in-depth experiments are obtained in real time upon cycling the electrode, which allows investigating the reactions occurring in the material within a realistic timescale, which is compatible with electrochemical capacitors practical operation. Both Fe K-edge and W L -edge measurements point out the involvement of the Fe /Fe redox couple in the charge storage while W acts as a spectator cation. The result of this study enables to unambiguously discriminate between the Faradaic and capacitive behavior of FeWO . Beside these valuable insights toward the full description of the charge storage mechanism in FeWO , this paper demonstrates the potential of operando X-ray absorption spectroscopy to enable a better material engineering for new high capacitance pseudocapacitive materials. 4 3 4 4 3+ 2+ 6+

  15. Complex Hydride Solid Electrolytes of the Li(CB9H10)-Li(CB11H12) Quasi-Binary System: Relationship between the Solid Solution and Phase Transition, and the Electrochemical Properties 国際誌 査読有り

    Sangryun Kim, Kazuaki Kisu, Shigeyuki Takagi, Hiroyuki Oguchi, Shin Ichi Orimo

    ACS Applied Energy Materials 3 (5) 4831-4839 2020年5月26日

    出版者・発行元:AMER CHEMICAL SOC

    DOI: 10.1021/acsaem.0c00433  

    ISSN:2574-0962

    eISSN:2574-0962

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    Closo-type complex hydrides have recently received much attention as promising solid electrolyte systems for all-solid-state batteries, because of the high lithium ion conductivity of their high-temperature (high-T) phases, excellent stability against a lithium metal anode, and a highly deformable nature. However, the superionic conductivity of closo-type complex hydrides is achieved in only a few materials; therefore, an understanding of the material factors involved in the formation of the high-T phase at room temperature and experimental demonstration of their battery applications are required. Here, we report the relationship between the solid solution and formation of the high-T phase of the Li(CB9H10)-Li(CB11H12) quasi-binary system, and the electrochemical properties as a solid electrolyte for all-solid-state Li-TiS2 batteries. The single-phase solid solutions, Li(CB9H10)-based phase in which [CB9H10]- is partially substituted with [CB11H12]- and Li(CB11H12)-based phase in which [CB11H12]- is partially substituted with [CB9H10]-, are obtained at compositions with low- and high-x in the (1 - x)Li(CB9H10)-xLi(CB11H12) (0.1 ≤ x ≤ 0.9) system. The effect of the solid solution on structural changes is more noticeable at low x, whereby a superionic conducting phase is formed with an identical structural framework as that of the high-T phase of Li(CB9H10) at room temperature. In addition, the 0.7Li(CB9H10)-0.3Li(CB11H12) (x = 0.3) solid electrolyte exhibits high chemical/electrochemical stability against a TiS2 cathode, which leads to superior performance in the rate capability and cycle life of all-solid-state Li-TiS2 batteries. The results presented here offer insights into strategies for the design of complex hydride lithium superionic conductors and for the development of all-solid-state batteries with these solid electrolytes.

  16. Room temperature operation of all-solid-state battery using a closo-type complex hydride solid electrolyte and a LiCoO2 cathode by interfacial modification 査読有り

    Sangryun Kim, Kentaro Harada, Naoki Toyama, Hiroyuki Oguchi, Kazuaki Kisu, Shin ichi Orimo

    Journal of Energy Chemistry 43 47-51 2020年4月

    出版者・発行元:ELSEVIER

    DOI: 10.1016/j.jechem.2019.08.007  

    ISSN:2095-4956

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    We report on an all-solid-state battery that employs a closo-type complex hydride solid electrolyte and a LiCoO cathode. Interfacial modification between the solid electrolyte and cathode with a LiNbO buffer layer enables reversible charge-discharge cycling with a cell voltage of 3.9 V (vs. Li /Li) at room temperature. Electrochemical analyses clarify that the given modification effectively suppresses side reactions at the cathode/solid electrolyte interface. The interfacial resistance is lowered by ca. 10 times with a 5 nm thick LiNbO buffer layer compared to that without a buffer layer, so that a discharge capacity of 109 mAh g is achieved. These results suggest that interfacial modification can be a viable approach to the development of high-voltage all-solid-state batteries using closo-type complex hydride solid electrolytes and oxide cathodes. 2 3 3 + −1

  17. Magnesium Borohydride Ammonia Borane as a Magnesium Ionic Conductor 査読有り

    Kazuaki Kisu, Sangryun Kim, Munehiro Inukai, Hiroyuki Oguchi, Shigeyuki Takagi, Shin Ichi Orimo

    ACS Applied Energy Materials 3 (4) 3174-3179 2020年4月

    出版者・発行元:AMER CHEMICAL SOC

    DOI: 10.1021/acsaem.0c00113  

    ISSN:2574-0962

    eISSN:2574-0962

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    Magnesium borohydride ammonia borane, Mg(BH4)2(NH3BH3)2, was electrochemically investigated. Impedance measurements of the mechanochemically synthesized Mg(BH4)2(NH3BH3)2 exhibited an ionic conductivity of 1.3 × 10-5 S cm-1 at 30 °C. Electrochemical cells fabricated with Mg(BH4)2(NH3BH3)2 as the solid electrolyte demonstrated reversible Mg migration through the material, indicating its potential for use as a Mg ionic conductor in all-solid-state Mg-ion batteries.

  18. Noncrystalline Nanocomposites as a Remedy for the Low Diffusivity of Multivalent Ions in Battery Cathodes 査読有り

    Yuki Orikasa, Kazuaki Kisu, Etsuro Iwama, Wako Naoi, Yusuke Yamaguchi, Yoshitomo Yamaguchi, Naohisa Okita, Koji Ohara, Toshiyuki Munesada, Masashi Hattori, Kentaro Yamamoto, Patrick Rozier, Patrice Simon, Katsuhiko Naoi

    Chemistry of Materials 32 (3) 1011-1021 2020年2月11日

    出版者・発行元:AMER CHEMICAL SOC

    DOI: 10.1021/acs.chemmater.9b03665  

    ISSN:0897-4756

    eISSN:1520-5002

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    Rechargeable batteries using multivalent metals are among the most promising next-generation battery systems due to their high capacity, high safety, and low cost compared with lithium-ion batteries. However, strong cation-anion interaction degrades diffusion in solid cathodes, an effect that must be mitigated to yield practical multivalent metal batteries. We show that a highly defective iron phosphate-carbon composite prepared by ultracentrifugation serves as a reversible insertion/deinsertion for magnesium ions with, and operates beyond, a 2-V cell voltage at room temperature. A composite of noncrystalline particles that embeds the surrounding carbon structure enhances the magnesium-ion diffusion in the solid phase with stability for cycle life. X-ray absorption spectroscopy, transmission electron microscopy with energy-dispersive X-ray spectroscopy, and high-energy X-ray scattering measurements demonstrate magnesium-ion insertion and extraction in the defective iron phosphate without conversion reactions. This work suggests promising applications for highly defective structures as intercalation hosts for multivalent ions.

  19. Photo-crosslinked polymer electrolytes containing solvate ionic liquids: An approach to achieve both good mechanical and electrochemical performances for rechargeable lithium ion batteries 査読有り

    Manjit Singh Grewal, Kazuaki Kisu, Shin Ichi Orimo, Hiroshi Yabu

    Chemistry Letters 49 (12) 1465-1469 2020年

    DOI: 10.1246/CL.200572  

    ISSN:0366-7022

    eISSN:1348-0715

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    Development of innovative polymer electrolytes that simultaneously possesses high mechanical stiffness as well as liquid-like ion motions is desirable for safer lithium-ion secondary batteries. Herein, bifunctional poly(ethylene glycol) diacrylate (PEGDA) based cross-linked network polymer electrolytes (PE) plasticized by tetraglyme at various lithium salt concentrations were fabricated via a solvent-free UV-curing process using a photo-initiator, 2,2-dimethoxy-2-phenylacetophenone (DMAP). The outstanding results demonstrate potential for safer high-performance rechargeable lithium-ion batteries.

  20. Interfacial stability between LiBH4-based complex hydride solid electrolytes and Li metal anode for all-solid-state Li batteries 査読有り

    Kazuaki Kisu, Sangryun Kim, Hiroyuki Oguchi, Naoki Toyama, Shin ichi Orimo

    Journal of Power Sources 436 2019年10月1日

    出版者・発行元:ELSEVIER

    DOI: 10.1016/j.jpowsour.2019.226821  

    ISSN:0378-7753

    eISSN:1873-2755

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    LiBH -based complex hydrides have attracted much attention as solid electrolytes that are highly compatible with Li metal anode, because of their reducing character and deformable nature. However, the compatibility of LiBH -based complex hydrides following the formation of a stable interface with Li metal has not yet been fully verified. In this study, electrochemical and mechanical stabilities of LiBH and Li (BH ) I complex hydride solid electrolytes against Li metal were investigated. Li plating/stripping test performed for 100 cycles and cyclic voltammetry indicated their favorable electrochemical stabilities. Scanning electron microscopy and fast charge–discharge tests revealed the formation of a mechanically tight and durable interface between these solid electrolytes and the Li metal anode. To demonstrate the adequacy of the LiBH -based complex hydride solid electrolyte for all-solid-state batteries with Li metal anode, an all-solid-state Li–S battery with a Li (BH ) I solid electrolyte was assembled and electrochemically tested. The battery showed reversible discharge and charge abilities. This study provides useful insights into a strategy that can be applied to develop complex hydride solid electrolytes. 4 4 4 4 4 3 4 4 4 3

  21. Stabilizing the Structure of LiCoPO4 Nanocrystals via Addition of Fe<sup>3+</sup>: Formation of Fe<sup>3+</sup> Surface Layer, Creation of Diffusion-Enhancing Vacancies, and Enabling High-Voltage Battery Operation 査読有り

    Naohisa Okita, Kazuaki Kisu, Etsuro Iwama, Yuki Sakai, Yiyo Lim, Yusuke Takami, Moulay Tahar Sougrati, Thierry Brousse, Patrick Rozier, Patrice Simon, Wako Naoi, Katsuhiko Naoi

    Chemistry of Materials 30 (19) 6675-6683 2018年10月9日

    DOI: 10.1021/acs.chemmater.8b01965  

    ISSN:0897-4756

    eISSN:1520-5002

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    Factors affecting the cyclability of the Fe-substituted LiCoPO (LiCo Fe PO , LCFP) material were elucidated, including both the structural and electrode/electrolyte stability. Electrochemical characterization of the synthesized LCFP nanoparticles lends clear evidence for improved electrochemical stability of LCP, as well as enhanced rate capability, with Fe substitution. Surface analysis using X-ray photoelectron spectroscopy (XPS) and electron energy loss spectroscopy (EELS) suggest that Fe enrichment on the surface of LCFP occurs through the oxidation of Fe into Fe in the synthesis process. The Fe -rich phase on the LCP surface enhances the stability of the delithiated phase, preventing oxidative reactions with electrolytes during high-voltage operation. This surface protection persists as long as the electrochemical reduction of Fe is avoided by ensuring that the full range of operating voltages lie above the Fe /Fe redox potential. Our findings may offer new approaches to stabilize the structure of LCP and other high-voltage positive electrodes for use in 5 V-class Li-ion batteries. 4 0.8 0.2 4 3+ 2+ 3+ 3+ 3+ 3+ 2+

  22. Internal resistance mapping preparation to optimize electrode thickness and density using symmetric cell for high-performance lithium-ion batteries and capacitors 査読有り

    Kazuaki Kisu, Shintaro Aoyagi, Haruka Nagatomo, Etsuro Iwama, McMahon Thomas Homer Reid, Wako Naoi, Katsuhiko Naoi

    Journal of Power Sources 396 (31) 207-212 2018年8月31日

    出版者・発行元:Elsevier B.V.

    DOI: 10.1016/j.jpowsour.2018.05.083  

    ISSN:0378-7753

    詳細を見る 詳細を閉じる

    Methods for characterizing and optimizing the internal resistance of electrodes are crucial for achieving the simultaneous goals of high energy density and high power density in lithium-ion batteries. In this study we propose—and confirm the efficacy of—a method for electrode design optimization based on the construction of an internal resistance map, a visualization tool for minimizing electrode resistance. The construction of the map proceeds by identifying the three primary components of the electrode resistance—charge-transfer resistance, ionic resistance, and contact resistance—and elucidating the dependence of each component on electrode density and thickness. We fabricate electrode sheets of various densities and thicknesses and conduct electrode impedance spectroscopy (EIS) measurements to measure the dependence of internal resistance on density and thickness, which we characterize via empirical formulas incorporated into our internal resistance map. Using our map, we predict that the resistance per unit area of a nickel-cobalt- manganese (NCM) electrode attains its minimum value at thickness 70 μm and density 2.9 g cm . We then further use the map to predict variations in IR drop for NCM electrodes of different densities, obtaining results in excellent agreement with experimental measurements. −3

  23. Cation-Disordered Li3VO4: Reversible Li Insertion/Deinsertion Mechanism for Quasi Li-Rich Layered Li1+x[V1/2Li1/2]O2 (x = 0–1) 査読有り

    Patrick Rozier, Etsuro Iwama, Nagare Nishio, Kazuhisa Baba, Keisuke Matsumura, Kazuaki Kisu, Junichi Miyamoto, Wako Naoi, Yuki Orikasa, Patrice Simon, Katsuhiko Naoi

    Chemistry of Materials 30 (15) 4926-4934 2018年8月14日

    DOI: 10.1021/acs.chemmater.8b00721  

    ISSN:0897-4756

    eISSN:1520-5002

    詳細を見る 詳細を閉じる

    The reversible lithiation/delithiation mechanism of the cation-disordered Li VO material was elucidated, including the understanding of structural and electrochemical signature changes during cycling. The initial exchange of two Li induces a progressive and irreversible 7migration of Li and V ions from tetrahedral to octahedral sites, confirmed by the combination of in situ/operando X-ray diffraction and X-ray absorption fine structure analyses. The resulting cation-disordered Li VO can smoothly and reversibly accommodate two Li and shows a Li diffusion coefficient larger by 2 orders of magnitude than the one of pristine Li VO , leading to improved electrochemical performance. This cation-disordered Li VO negative electrode offers new opportunities for designing high-energy and high-power supercapacitors. Furthermore, it opens new paths for preparing disordered compounds with the general hexagonal close-packing structure, including most polyanionic compounds, whose electrochemical performance can be easily improved by simple cation mixing. 3 4 3 4 3 4 3 4 +

  24. 太陽光発電を高効率・有効利用する次世代キャパシタの開発

    Kazuaki Kisu

    日本エネルギー学会機関誌えねるみくす 97 (4) 328-334 2018年7月20日

    DOI: 10.20550/jieenermix.97.4_328  

    ISSN:2432-3586 2432-3594

  25. 超遠心ナノハイブリッド技による次世代ハイブリッドキャパシタ電極材料の研究開発

    直井 勝彦, 岩間 悦郎, 木須 一彰

    Electrochemistry 85 (11) 740-745 2017年7月

    DOI: 10.5796/electrochemistry.85.740  

    ISSN:1344-3542 2186-2451

  26. 10 - Enhanced Hybrid Supercapacitors Utilizing Nanostructured Metal Oxides A2 - Dubal, Deepak P

    Iwama, Etsuro, Kisu, Kazuaki, Naoi, Wako, Simon, Patrice, Naoi, Katsuhiko

    Metal Oxides in Supercapacitors 247-264 2017年

    DOI: 10.1016/B978-0-12-810464-4.00010-3  

  27. Electrochemical kinetics of nanostructure LiFePO4/graphitic carbon electrodes 査読有り

    Kazuaki Kisu, Etsuro Iwama, Wako Naoi, Patrice Simon, Katsuhiko Naoi

    Electrochemistry Communications 72 10-14 2016年11月1日

    出版者・発行元:ELSEVIER SCIENCE INC

    DOI: 10.1016/j.elecom.2016.08.013  

    ISSN:1388-2481

    eISSN:1873-1902

    詳細を見る 詳細を閉じる

    Lithium cation insertion/deinsertion reaction kinetics in a LiFePO (LFP)/graphitic carbon composite material were electrochemically studied with a cavity microelectrode (CME). The LFP/graphitic carbon composite has a core LFP (crystalline/amorphous)/graphitic carbon shell structure. In the crystalline and amorphous LFP phase, different reaction mechanisms were observed and characterized. While the reaction mechanism in the crystalline LFP phase is controlled by Li diffusion, the amorphous LFP phase shows a fast, surface-controlled, pseudocapacitive charge-storage mechanism. This pseudocapacitive behavior is extrinsic in origin since it comes from the presence of Fe defects in the structure. These features explain the ultrafast performance of the material which offers interesting opportunities as a positive electrode for assembling high power and high energy hybrid supercapacitors. 4 + 3 +

  28. Ultrafast charge-discharge characteristics of a nanosized core-shell structured LiFePO4 material for hybrid supercapacitor applications 査読有り

    Katsuhiko Naoi, Kazuaki Kisu, Etsuro Iwama, Shota Nakashima, Yuki Sakai, Yuki Orikasa, Philippe Leone, Nicolas Dupré, Thierry Brousse, Patrick Rozier, Wako Naoi, Patrice Simon

    Energy and Environmental Science 9 (6) 2143-2151 2016年6月

    出版者・発行元:ROYAL SOC CHEMISTRY

    DOI: 10.1039/c6ee00829a  

    ISSN:1754-5692

    eISSN:1754-5706

    詳細を見る 詳細を閉じる

    Highly dispersed crystalline/amorphous LiFePO (LFP) nanoparticles encapsulated within hollow-structured graphitic carbon were synthesized using an in situ ultracentrifugation process. Ultracentrifugation triggered an in situ sol-gel reaction that led to the formation of core-shell LFP simultaneously hybridized with fractured graphitic carbon. The structure has double cores that contain a crystalline LFP (core 1) covered by an amorphous LFP containing Fe defects (core 2), which are encapsulated by graphitic carbon (shell). These core-shell LFP nanocomposites show improved Li diffusivity thanks to the presence of an amorphous LFP phase. This material enables ultrafast discharge rates (60 mA h g at 100C and 36 mA h g at 300C) as well as ultrafast charge rates (60 mA h g at 100C and 36 mA h g at 300C). The synthesized core-shell nanocomposites overcome the inherent one-dimensional diffusion limitation in LFP and yet deliver/store high electrochemical capacity in both ways symmetrically up to 480C. Such a high rate symmetric capacity for both charge and discharge has never been reported so far for LFP cathode materials. This offers new opportunities for designing high-energy and high-power hybrid supercapacitors. 4 3+ + -1 -1 -1 -1

  29. Enhanced Electrochemical Performance of Ultracentrifugation-Derived nc-Li3VO4/MWCNT Composites for Hybrid Supercapacitors 査読有り

    Etsuro Iwama, Nozomi Kawabata, Nagare Nishio, Kazuaki Kisu, Junichi Miyamoto, Wako Naoi, Patrick Rozier, Patrice Simon, Katsuhiko Naoi

    ACS Nano 10 (5) 5398-5404 2016年5月24日

    出版者・発行元:AMER CHEMICAL SOC

    DOI: 10.1021/acsnano.6b01617  

    ISSN:1936-0851

    eISSN:1936-086X

    詳細を見る 詳細を閉じる

    Nanocrystalline Li VO dispersed within multiwalled carbon nanotubes (MWCNTs) was prepared using an ultracentrifugation (uc) process and electrochemically characterized in Li-containing electrolyte. When charged and discharged down to 0.1 V vs Li, the material reached 330 mAh g (per composite) at an average voltage of about 1.0 V vs Li, with more than 50% capacity retention at a high current density of 20 A g . This current corresponds to a nearly 500C rate (7.2 s) for a porous carbon electrode normally used in electric double-layer capacitor devices (1C = 40 mA g per activated carbon). The irreversible structure transformation during the first lithiation, assimilated as an activation process, was elucidated by careful investigation of in operando X-ray diffraction and X-ray absorption fine structure measurements. The activation process switches the reaction mechanism from a slow "two-phase" to a fast "solid-solution" in a limited voltage range (2.5-0.76 V vs Li), still keeping the capacity as high as 115 mAh g (per composite). The uc-Li VO composite operated in this potential range after the activation process allows fast Li intercalation/deintercalation with a small voltage hysteresis, leading to higher energy efficiency. It offers a promising alternative to replace high-rate Li Ti O electrodes in hybrid supercapacitor applications. 3 4 3 4 4 5 12 -1 -1 -1 -1 +

  30. Cathode Properties of Nanocrystalline Li3V1.8Al0.2(PO4)3/Multi-Walled Carbon Nanotube Composites for Hybrid Capacitor Prepared via Ultra-Centrifugation Treatment 査読有り

    Katsuhiko Naoi, Kazuaki Kisu, Naohisa Okita, Mariko Shinoda, Masanori Muramatsu, Etsuro Iwama, Wako Naoi

    Electrochemistry 83 (4) 249-255 2015年

    出版者・発行元:ELECTROCHEMICAL SOC JAPAN

    DOI: 10.5796/electrochemistry.83.249  

    ISSN:1344-3542

    eISSN:2186-2451

    詳細を見る 詳細を閉じる

    Highly-dispersed Li V Al (PO ) nanoparticles which are directly impregnated onto the surface of multi-walled carbon nanotubes (MWCNT) were successfully synthesized via a unique two-step process using an ultracentrifugation at 75,000 g. The synthetic procedure of the Li V Al (PO ) /MWCNT composite involves the following two steps: i) precipitation of V Al O (10-100nm) nanoparticles on the surface of MWCNT, and ii) the subsequent transformation of the V Al O into the Li V Al (PO ) nanoparticles without any change of their shape and dimensions. The 10% of Al-doping brought out an increase in the discharge capacity from 119 to 124mAhg per Li V Al (PO ) , which corresponds to a 14% increase of the Li V Al (PO ) utilization ratio. The Al-doping also reduced its electric resistance by 26%. The Li V Al (PO ) /MWCNT with such an efficient electron transport can deliver excellent electrochemical performances ever attained to date; capacity density of 85mAh g at a high discharge rate of 480C and stable cycle performance over 10,000 cycles at 10C rate with 85% retention of the initial capacity. 3 1.8 0.2 4 3 3 1.8 0.2 4 3 1.8 0.2 3 1.8 0.2 3 3 1.8 0.2 4 3 3 2-x x 4 3 3 2-x x 4 3 3 1.8 0.2 4 3 -1 -1

  31. Ultrafast Cathode Characteristics of Nanocrystalline-Li3V2(PO4)3/Carbon Nanofiber Composites 査読有り

    Katsuhiko Naoi, Kazuaki Kisu, Etsuro Iwama, Yuki Sato, Mariko Shinoda, Naohisa Okita, Wako Naoi

    Journal of the Electrochemical Society 162 (6) A827-A833 2015年

    出版者・発行元:ELECTROCHEMICAL SOC INC

    DOI: 10.1149/2.0021506jes  

    ISSN:0013-4651

    eISSN:1945-7111

    詳細を見る 詳細を閉じる

    Anisotropically grown Li V (PO ) nanocrystals, which are highly dispersed and directly impregnated on the surface of a carbon nanofiber (CNF), were successfully synthesized via a two-step synthesis process: i) precipitation of nanoplated V O precursors (20-200 nm); ii) transformation of the V O precursor into Li V (PO ) nanoplates without size change. The direct attachment of the Li V (PO ) nanocrystals to the carbon surface improves the electronic conductivity and Li diffusivity of the entire Li V (PO ) /CNF composite, simultaneously producing a mesoporous network (pore size of approximately 10 nm) that acts as an electrolyte reservoir owing to the pillar effect of the impregnated Li V (PO ) crystals. This ideal Li V (PO ) /CNF nanostructure enabled a 480C rate (7.5 seconds) discharge with 83 mA h g , and 69% of capacity retention at the slowest discharge rate (1C). Such an ultrafast charge-discharge performance opens the possibility of using Li V (PO ) as a cathode material for ultrafast lithium ion batteries with a stable cycle performance over 10,000 cycles at a 10C rate, maintaining 85% of the initial capacity. 3 2 4 3 2 3 2 3 3 2 4 3 3 2 4 3 3 2 4 3 3 2 4 3 3 2 4 3 3 2 4 3 + -1

  32. Ultrafast nano-spherical single-crystalline LiMn0.792Fe0.198Mg0.010PO4 solid-solution confined among unbundled interstices of SGCNTs 査読有り

    Kazuaki Kisu, Etsuro Iwama, Wataru Onishi, Shota Nakashima, Wako Naoi, Katsuhiko Naoi

    Journal of Materials Chemistry A 2 (48) 20789-20798 2014年12月28日

    出版者・発行元:ROYAL SOC CHEMISTRY

    DOI: 10.1039/c4ta04723k  

    ISSN:2050-7488

    eISSN:2050-7496

    詳細を見る 詳細を閉じる

    Spherical LiMn Fe Mg PO nanocrystals, which are highly dispersed and encapsulated within the interstices of supergrowth (single-walled) carbon nanotubes (SGCNTs), were successfully synthesized by in situ material processing technology called "ultra-centrifuging (UC) treatment". TEM images of these LiMn Fe Mg PO /SGCNT composites suggest the direct attachment of the LiMn Fe Mg PO nanocrystals (10-40 nm) onto the surface of highly conductive SGCNTs. Mg-doping brought out 10% increase of Li capacity in Mn sites with 200% increase of Li diffusivity and 50% decrease of electrical resistance owing to such peculiar "nano-nano LiMn Fe Mg PO /SGCNT composites". The synthesized LiMn Fe Mg PO /SGCNT composites overcome the inherent restrictions of one-dimensional diffusion and deliver a high electrochemical capacity density of ca. 54 mA h g per composite (corresponding to 77 mA h g per pure LiMn Fe Mg PO ) at a high rate of 50 C, while showing excellent cycle life, retaining 84% of the initial capacity over 3000 cycles. 0.792 0.198 0.010 4 0.792 0.198 0.010 4 0.792 0.198 0.010 4 0.792 0.198 0.010 4 0.792 0.198 0.010 4 0.792 0.198 0.010 4 + + -1 -1

  33. The origin of anomalous large reversible capacity for SnO2 conversion reaction 査読有り

    Kazuaki Kisu, Minami Iijima, Etsuro Iwama, Morihiro Saito, Yuki Orikasa, Wako Naoi, Katsuhiko Naoi

    Journal of Materials Chemistry A 2 (32) 13058-13068 2014年8月28日

    出版者・発行元:ROYAL SOC CHEMISTRY

    DOI: 10.1039/c4ta01994f  

    ISSN:2050-7488

    eISSN:2050-7496

    詳細を見る 詳細を閉じる

    Single-nanocrystalline SnO (2-4 nm φ) particles completely encapsulated within hollow-structured carbon black structures (Ketjen Black (KB), typically 40 nm φ) were prepared using our original in situ ultracentrifugation (UC treatment) materials processing technology. Ultracentrifugation at 75000g induces an in situ sol-gel reaction that brings about optimized linking between limited-size SnO nanocrystals and microcrystalline graphitic carbons of KB. Efficient entanglement and nanonesting have been accomplished by simultaneous nanofabrication and nanohybridization in the UC treatment, specifically at a ratio of SnO /KB = 45/55. This composite exhibited a reversible capacity of 837 mA h g per composite, equivalent to 1444 mA h g (per pure SnO after subtracting the capacity attributed to KB in the composite) for remarkably many cycles, over 1200. Such high performance in regard to both capacity and cyclability has never been attained so far for SnO anode materials. The reversibility of changes in the Sn valence state (defined as "formal valence state" in the manuscript) from Sn(2.9+) to Sn(4.4-) was demonstrated by in situ XAFS measurements during the lithiation-delithiation process. Peculiar nanodots of typically 2-4 nm that look like single-crystal SnO /carbon core-shell structures were found for the optimized dose ratio (45/55) in the HRTEM observation. After 10 cycles, all the materials showed complete encapsulation of the same-sized nanoparticles, which were covered and nested within the KB matrix and an electrolyte-derived polymeric film. These results indicate that the initially prepared SnO /KB composites were transformed into a new species, represented as Li SnO (x: 0-7.3), which shows perfect reversibility and cyclability. This species can exchange a total of 7.3 electrons, including 2.9 electrons for the conversion reaction (1-2 V) and 4.4 electrons for the subsequent alloying process (0-1 V). © 2014 the Partner Organisations. 2 2 2 2 2 2 2 x 1.45 -1 -1

︎全件表示 ︎最初の5件までを表示

MISC 4

  1. 錯体水素化物系イオン伝導体を用いた全固体電池の開発動向 招待有り

    木須一彰, 折茂慎一

    科学と工業 96 (12) 1-6 2022年12月

  2. 錯体水素化物系マグネシウムイオン伝導体の開発 招待有り

    木須一彰, 金相侖, 折茂慎一

    セラミックス 56 (2) 72-75 2021年2月

  3. 水素化物系全固体電池の開発動向, 高速陽イオン伝導と電極界面安定性 招待有り

    木須一彰, 金相侖, 折茂慎一

    電池技術 32 145-151 2020年10月

  4. 錯体水素化物リチウムイオン伝導体を用いた全固体電池 (特集 二次電池の現状と開発の動向) 招待有り

    金 相侖, 木須 一彰, 折茂 慎一

    電気評論 104 (11) 20-26 2019年11月

    出版者・発行元:電気評論社

    ISSN:0285-5860

書籍等出版物 6

  1. "カルシウム蓄電池 〜錯体水素化物を用いた ハロゲンフリー電解質〜”, 次世代二次電池の開発動向

    木須一彰, 折茂慎一

    シーエムシー出版 2023年4月

  2. Hydrogenomics: The Science of Fully Utilizing Hydrogen

    Kazuaki Kisu

    Kyoritsu Shuppan Co. Ltd. 2023年3月

  3. “水素"を使いこなすためのサイエンス ハイドロジェノミクス

    木須一彰

    共立出版 2022年1月

  4. 全固体電池の界面抵抗低減と作製プロセス、評価技術

    金相侖, 木須一彰, 折茂慎一

    技術情報協会 2020年3月

  5. 電気化学・インピーダンス測定のデータ解析手法と事例集

    木須一彰, 岩間悦郎, 直井勝彦

    技術情報協会 2018年12月

  6. 次世代電池用電極材料の高エネルギー密度、高出力化

    木須一彰, 沖田尚久, 岩間悦郎, 直井和子, 直井勝彦

    技術情報協会 2017年11月

︎全件表示 ︎最初の5件までを表示

講演・口頭発表等 82

  1. 錯体水素化物系電解質の開発と次世代蓄電池への応用 招待有り

    木須一彰

    令和5年度 試験・分析技術研究会 技術講演会 2023年5月

  2. カルシウム蓄電池〜錯体水素化物を用いたハロゲンフリー電解質〜 招待有り

    木須一彰

    近化電池セミナー「金属負極二次電池の現状と展望」 2023年4月

  3. Hydride-based Monocarborane for Calcium Battery Electrolyte

    第32回日本MRS年次大会 2022年12月

  4. 水素化物系電解質 Ca(CB11H12)2 を用いたカルシウム蓄電池の電気化学評価

    木須一彰, 篠原宝良, 折茂慎一

    第52回電池討論会 2022年11月

  5. 錯体水素化物イオン伝導体の開発と次世代蓄電池への応用 招待有り

    木須 一彰

    第30回バッテリー技術シンポジウム 2022年8月

  6. Monocarborane Cluster Electrolyte for Room-Temperature Calcium Batteries

    Kazuaki Kisu

    SUSTech-AIMR joint workshop 2022年7月

  7. COMPLEX HYDRIDE-BASED ELECTROLYTES FOR MULTIVALENT BATTERY APPLICATION

    Kazuaki Kisu, Sangryun Kim, Munehiro Inukai, Andreas Züttel, Shin-ichi Orimo

    2nd Intetnational Symposium "Hydrogenomics" 2022年5月

  8. Complex Hydride-based Electrolytes for Multivalent Battery Application 招待有り

    Kazuaki Kisu, Shin-ichi Orimo

    International Conference on Frontier Materials 2022 2022年5月

  9. Calcium Battery Electrolyte with Hydride-based Monocarborane Cluster

    Kazuaki Kisu, Sangryun Kim, Kun Zhao, Andreas Züttel, Shin‐ichi Orimo

    Material Research Meeting 2021 (MRM2021) 2021年12月13日

  10. カルシウム蓄電池用電解質 Ca[CB11H12]2 の合成と電気化学評価

    木須一彰, 金相侖, 折茂慎一

    第62回 電池討論会 2021年11月30日

  11. Hydride-based Monocarborane Cluster for Calcium Battery Electrolyte

    Kazuaki Kisu, Sangryun Kim, Shin-ichi Orimo

    5th Symposium for the Core Research Clusters for Materials Science and Spintronics 2021年10月26日

  12. 次世代エネルギーデバイスに向けた錯体水素化物の開発

    木須 一彰

    第10回 MaSC 技術交流会 2021年9月29日

  13. 錯体水素化物系電解質 Ca[CB11H12]2 の合成と電気化学評価

    木須一彰, 金相侖, 折茂慎一

    日本金属学会 第169回秋期講演大会 2021年9月14日

  14. カルシウムイオン電池用電解質 Ca(CB11H12)2の合成と特性評価

    木須一彰, 金相侖, 折茂慎一

    第140回東北大学金属材料研究所講演会 2021年5月26日

  15. Energy Related Application of Hydrides

    Kazuaki Kisu

    Joint Workshop AIMR-Fraunhofer ENAS 2021年4月22日

  16. 錯体水素化物マグネシウムイオン伝導体Mg(BH4)2(NH3BH3)2の電気化学特性

    木須一彰, 金相侖, 犬飼宗弘, 大口裕之, 高木成幸, 折茂慎一

    日本金属学会 第168回春期講演大会 2021年3月

  17. マグネシウムイオン伝導体Mg(BH4)2(NH3BH3)2の電気化学特性

    木須一彰, 金相侖, 犬飼宗弘, 大口裕之, 高木成幸, 折茂慎一

    第61回電池討論会 2020年11月

  18. Electrochemical characterization of Magnesium Borohydride Ammonia Borane Mg(BH4)2(NH3BH3)2 as a Magnesium Ionic Conductor

    K. Kisu, S. Kim, M. Inukai, H. Oguchi, S. Takagi, S. Orimo

    The 4th Symposium for The Core Research Cluster for Materials Science 2020年10月

  19. LiBH4系錯体水素化物固体電解質を用いたリチウム-硫黄全固体電池の電極/電解質界面安定性

    木須一彰, 金相侖, 大口裕之, 折茂慎一

    電気化学会第87回大会 2020年3月

  20. Microstructural analyses of all-solid-state Li-S battery using LiBH4-based solid electrolyte for prolonged cycle performance

    K. Kisu, S. Kim, S. Orimo

    The 3rd Symposium for The Core Research Clusters for Materials Science and Spintronics 2020年2月

  21. ALL SOLID-STATE BATTERIES USING LIBH4-BASED SOLID ELECTROLYTE AND LITHIUM METAL ELECTRODE

    K. Kisu, S. Kim, S. Orimo

    1st International Symposium “Hydrogenomics” combined with 14th International Symposium Hydrogen & Energy 2020年1月

  22. 錯体水素化物固体電解質を用いたリチウム硫黄全固体電池の開発

    木須一彰, 金相侖, 折茂慎一

    第4回若手育成スクール(新学術領域研究ハイドロジェノミクス) 2019年8月

  23. Interfacial stability between lithium metal anode and LiBH4-based complex hydride solid electrolytes for all-solid-state lithium battery

    K. Kisu, S. Kim, H. Oguchi, N. Toyama, S. Orimo

    22nd International Conference on Solid State Ionics (SSI-22) 2019年6月

  24. All solid-state batteries using complex hydrides solid electrolyte and lithium metal electrode

    K. Kisu, S. Kim, H. Oguchi, N. Toyama, S. Orimo

    Hydrogen-Metal Systems, Gordon Research Conference 2019年6月

  25. Li4(BH4)3I固体電解質を用いたリチウム-硫黄全固体電池の電極/電解質界面安定性

    木須一彰, 金相侖, 外山直樹, 大口裕之, 折茂慎一

    日本金属学会 第164回春期講演大会 2019年3月

  26. Interface stability of LiBH4-based complex hydride solid electrolytes for all-solid-state lithium-ion battery

    K. Kisu, S. Kim, H. Oguchi, N. Toyama, S. Orimo

    The 2nd Symposium for World Leading Research Centers -Materials Science and Spintronics- 2019年2月

  27. LiBH4-LiI固体電解質を用いた全固体リチウム-硫黄電池の開発

    木須一彰, 金相侖, 大口裕之, 外山直樹, 折茂 慎一

    第 5回水素化物に関わる次世代学術・応用展開研究会 2018年11月

  28. Development of all solid-state lithium-sulfur batteries using sulfur electrode and LiBH4-LiI solid electrolytes

    Ryuga Yoshida, Kazuaki Kisu, Sangryun Kim, Hiroyuki Oguchi, Naoki Toyama, Shin-ichi Orimo

    The 136th IMR Lecture Meeting and Summit of Materials Science 2018 2018年10月

  29. Complex hydrides as solid electrolytes for rechargeable batteries 招待有り

    Kazuaki Kisu, Sangryun Kim, Hiroyuki Oguchi, Naoki Toyama, Shin-ichi Orimo

    16th International Symposium on Metal-Hydrogen Systems 2018年10月

  30. Intercalation Host Using Defective FePO4-Carbon Composite for Magnesium Rechargeable Battery Cathode

    Yuki Orikasa, Kazuaki Kisu, Etsuro Iwama, Wako Naoi, Yusuke Yamaguchi, Toshiyuki Munesada, Masashi Hattori, Kentaro Yamamoto, Patrick Rozier, Patrice Simon, Katsuhiko Naoi

    AiMES 2018 2018年10月

  31. LiBH4-LiI固体電解質を用いた高容量リチウム硫黄全固体電池の開発

    木須一彰, 金相侖, 大口裕之, 外山直樹, 折茂 慎一

    金属学会2018秋期講演大会 2018年9月

  32. Magnesium Intercalation Host of Defective FePO4-Carbon Composite

    Yusuke Yamaguchi, Yuki Orikasa, Kazuaki Kisu, Etsuro Iwama, Wako Naoi, Toshiyuki Munesada, Masashi Hattori, Kentaro Yamamoto, Patrick Rozier, Patrice Simon, Katsuhiko Naoi

    The 19th International Meeting on Lithium Batteries 2018年6月

  33. FePO4-Carbon Composite Electrode for Calcium Rechargeable Battery Cathode

    Yoshitomo Yamaguchi, Yuki Orikasa, Kazuaki Kisu, Etsuro Iwama, Wako Naoi, Patrick Rozier, Patrice Simon, Katsuhiko Naoi

    The 19th International Meeting on Lithium Batteries 2018年6月

  34. Li3VO4のリチウム脱挿入メカニズムとハイブリッドキャパシタ負極特性

    岩間悦郎, 馬場一久, 松村佳祐, 木須一彰, 直井和子, 折笠有基, ロジエ パトリック, シモン パトリース, 直井勝彦

    電気化学会第85回大会 2018年3月

  35. Li3V2(PO4)3/カーボン複合体のスーパーレドックスキャパシタ正極特性

    辰巳哲行, 沖田尚久, 永友遥, ボー グエンホンチャン, 木須一彰, 直井和子, 直井勝彦

    電気化学会第85回大会 2018年3月

  36. 高容量・高出力化に向けたLIB用多孔質電極の内部抵抗解析に関する研究

    永友遥, 木須一彰, 青柳真太郎, 直井和子, 直井勝彦

    電気化学会第85回大会 2018年3月

  37. 遷移金属酸硫化物Y2Ti2O5S2のハイブリッドキャパシタ負極材料としての電気化学特性評価

    木須一彰, 秋山大智, 工藤安未, 江川慶彦, 青柳真太郎, 岩間悦郎, 宮本淳一, 直井和子, 直井勝彦

    電気化学会第85回大会 2018年3月

  38. ハイブリッドキャパシタ用ナノ結晶TiO2(B)負極の高密度化/高出力化メカニズムの解析

    木須一彰, 江川慶彦, 青柳真太郎, 岩間悦郎, 宮本淳一, 直井和子, 直井勝彦

    電気化学会第85回大会 2018年3月

  39. Li3V2(PO4)3/カーボン複合体を用いたハイブリッドキャパシタ正極特性

    辰巳哲行, 沖田尚久, 深見太一, 永友遥, ボー グエンホンチャン, 木須一彰, 直井和子, 直井勝彦

    第58回電池討論会 2017年10月

  40. 移金属酸硫化物Y2Ti2O5S2のハイブリッドキャパシタ負極特性

    秋山大智, 青柳慎太郎, 岡崎敬太, 江川慶彦, 木須一彰, 岩間悦郎, 宮本淳一, 直井和子, 直井勝彦

    第58回電池討論会 2017年10月

  41. ナノ結晶TiO2(B)におけるハイブリットキャパシタの負極特性向上メカニズム

    江川慶彦, 青柳 真太郎, 岡崎敬太, 秋山大智, 宮本淳一, 木須一彰, 岩間悦郎, 直井和子, 直井勝彦

    第58回電池討論会 2017年10月

  42. LiCo0.8Fe0.2PO4/多層カーボンナノチューブ複合体のサイクル特性向上のメカニズム解析

    林怡瑤, 木須一彰, 沖田尚久, 酒井祐輝, 高見祐介, 直井和子, 直井勝彦

    第58回電池討論会 2017年10月

  43. 対称セルを用いた低密度・高密度型多孔質電極の内部抵抗解析

    永友遥, 木須一彰, 青柳真太郎, 直井和子, 直井勝彦

    第58回電池討論会 2017年10月

  44. Li-Insertion/Deinsertion Mechanism for Ultracentrifugation-Derived Li3VO4

    Etsuro Iwama, Nagare Nishio, Kazuhisa Baba, Keisuke Muramatsu, Yuki Orikasa, Kazuaki Kisu, Wako Naoi, Rozier Patrick, Simon Patrice, Katsuhiko Naoi

    The 58th Battery Symposium Japan (International Session) 2017年10月

  45. LiCo0.8Fe0.2PO4/Multi-Walled Carbon Nanotubes Nanocomposites for 5-Volts Class Lithium Ion Batteries

    Naohisa Okita, Kazuaki Kisu, Yuki Sakai, Yiyo Lim, Yusuke Takami, Brousse Thierry, Rozier Patrick, Simon Patrice, Wako Naoi, Katsuhiko Naoi

    The 58th Battery Symposium Japan (International Session) 2017年10月

  46. Lithium-ion Insertion/Deinsertion Reaction Kinetics in a Carbon-Nested Ultrafast Nano-LiFePO4

    Kazuaki Kisu, Etsuro Iwama, Yuki Orikasa, Wako Naoi, Philippe Leone, Nicolas Dupre, Thierry Brousse, Patrick Rozier, Patrice Simon, Katsuhiko Naoi

    The 58th Battery Symposium Japan (International Session) 2017年10月

  47. Nanocrystalline LiCo0.8Fe0.2PO4/Multi- Walled Carbon Nanotubes Positive Electrode for 5-Volts Class Lithium Ion Batteries

    Naohisa Okita, Kazuaki Kisu, Yuki Sakai, Yiyo Lim, Yusuke Takami, T. Brousse, P. Rozier, P. Simon, Wako Naoi, Katsuhiko Naoi

    232nd ECS MEETING 2017年10月

  48. Pseudo-Capacitive Behavior of Nanostructure LiFePO4/Graphitic Carbon Composite for Hybrid Capacitor 招待有り

    Kazuaki Kisu, Etsuro Iwama, Yuki Orikasa, Wako Naoi, Philippe Leone, Nicolas Dupre, Thierry Brousse, Patrick Rozier, Patrice Simon, Katsuhiko Naoi

    232nd ECS MEETING 2017年10月

  49. Nanocomposite of al-doped Li3V2(PO4)3/multi-walled carbon nanotubes for hybrid capacitors

    Naohisa Okita, Kazuaki Kisu, Taichi Fukami, Haruka Nagatomo, Satoyuki Tatsumi, Wako Naoi, Katsuhiko Naoi

    5th International Symposium on Enhanced Electrochemical Capacitors 2017年7月

  50. Ultrafast Carbon-Nested LiFePO4 Core-Shell Structured Nanomaterial for Hybrid EES

    Kazuaki Kisu, Etsuro Iwama, Yuki Orikasa, Wako Naoi, Philippe Leone, Nicolas Dupre, Thierry Brousse, Patrick Rozier, Patrice Simon, Katsuhiko Naoi

    5th International Symposium on Enhanced Electrochemical Capacitors 2017年7月

  51. ナノ結晶Li3VO4/MWCNTハイブリッドキャパシタ負極特性を引き出す電気化学活性化メカニズム

    馬場一久, 西尾流, 内笹井理奈, 岩間悦郎, 木須一彰, 宮本淳一, 直井和子, 直井勝彦

    電気化学会第84回大会 2017年3月

  52. 超遠心ナノハイブリッド技術を用いたLiCo0.8Fe0.2PO4/カーボン複合体のリチウムイオン二次電池正極特性

    林怡瑤, 沖田尚久, 酒井祐輝, 高見祐介, 木須一彰, 直井和子, 直井勝彦

    電気化学会第84回大会 2017年3月

  53. ナノ結晶Li3V1.9Al0.1(PO4)3/多層カーボンナノチューブ複合体のハイブリッドキャパシタ正極特性

    沖田尚久, 木須一彰, 深見太一, 永友遥, 辰巳哲行, 直井和子, 直井勝彦

    電気化学会第84回大会 2017年3月

  54. リチウムイオン電池用電極構造最適化に向けた簡易なEIS評価手法の開発と妥当性の検証

    永友遥, 木須一彰, 青柳真太郎, 直井和子, 直井勝彦

    電気化学会第84回大会 2017年3月

  55. ハイブリッドキャパシタ用正極材料に向けたナノLiFePO4/カーボン三層コアシェル複合体の作製と電気化学評価

    木須一彰, 岩間悦郎, 酒井祐輝, 折笠有基, 直井和子, 直井勝彦

    電気化学会第84回大会 2017年3月

  56. Li3V2(PO4)3/カーボン複合体への 異種元素ドーピングと正極特性

    深見太一, 沖田尚久, 永友遥, 木須一彰, 直井和子, 直井勝彦

    第57回電池討論会 2016年12月

  57. 超遠心ナノハイブリッド技術を用いた LiCoPO4/カーボン複合体のリチウムイオン二次電池正極特性

    酒井祐輝, 木須一彰, 沖田尚久, 林怡瑤, 直井和子, 直井勝彦

    第57回電池討論会 2016年12月

  58. リチウムイオン電池用負極材料バナジウム酸リチウム(Li3VO4)の高出力化

    馬場一久, 岩間悦郎, 川端望, 西尾流, 木須一彰, 宮本淳一, 直井和子, 直井勝彦

    日本化学会秋季事業 第6回CSJ化学フェスタ 2016年11月

  59. サイクル特性向上に向けたLiCoPO4/MWCNT複合体へのFe固溶による効果

    林怡瑤, 沖田尚久, 酒井祐輝, 木須一彰, 直井和子, 直井勝彦

    日本化学会秋季事業 第6回CSJ化学フェスタ 2016年11月

  60. リチウムイオン電池用電極における膜厚及び密度の電気化学特性に対する依存性の解析

    永友遥, 木須一彰, 青柳真太郎, 直井和子, 直井勝彦

    日本化学会秋季事業 第6回CSJ化学フェスタ 2016年11月

  61. Nanocrystalline Li3V1.9Al0.1(PO4)3/Multi-Walled Carbon Nanotubes Positive Electrode for Hybrid Supercapacitors

    Naohisa Okita, Kazuaki Kisu, Taichi Fukami, Etsuro Iwama, Wako Naoi, P. Rozier, P. Simon, Katsuhiko Naoi

    Pacific Rim Meeting on Electrochemical and Solid-State Science 2016 2016年10月

  62. Pseudocapacitive FeWO4 Electrode: From Charge Storage Mechanism to Practical Use in Asymmetric Cell

    Olivier Crosnier, Nicolas Goubard-Bretesch, Ga_tan Buvat, Camille Douard, Antonella Iadecola, St_phanie Belinh, Richard Retoux, Christophe Payen, Frederic Favier, Kazuaki Kisu, Etsuro Iwama, Katsuhiko Naoi, Marie-Liesse Doublet, Thierry Brousse

    Pacific Rim Meeting on Electrochemical and Solid-State Science 2016 2016年10月

  63. Electrochemical Kinetics of Carbon-Nested Ultrafast Nano-LiFePO4 for Hybrid EES

    Kazuaki Kisu, Etsuro Iwama, Shota Nakashima, Yuki Sakai, Yuki Orikasa, Wako Naoi, Philippe Leone, Nicolas Dupre, Thierry Brousse, Patrick Rozier, Patrice Simon, Katsuhiko Naoi

    Pacific Rim Meeting on Electrochemical and Solid-State Science 2016 2016年10月

  64. Pseudocapacitive FeWO4 compound: from fundamental to applications

    N. Goubard-Bretesch, G. Buvat, O. Crosnier, A. Iadecola, S. Belin, R. Retoux, C. Payen, F. Favier, Kazuaki Kisu, Etsuro Iwama, Katsuhiko Naoi, T. Brousse

    67th annual meeting of International Electrochemical Society 2016年8月

  65. Ultrafast Nanocrystalline Li3V1.9Al0.1(PO4)3 Directly Attached on the Surface Graphene Layers of Multi-Walled Carbon Nanotubes for Hybrid Capacitor

    Naohisa Okita, Kazuaki Kisu, Mariko Shinoda, Taichi Fukami, Etsuro Iwama, Wako Naoi, P. Rozier, P. Simon, Katsuhiko Naoi

    International Conference on Advanced Capacitor 2016 2016年6月

  66. Ultrafast Carbon-Nested LiFePO4 Core-Shell Structured Nanomaterial Prepared by Ultracentrifugation

    Kazuaki Kisu, Etsuro Iwama, Shota Nakashima, Yuki Sakai, Yuki Orikasa, Wako Naoi, Philippe Leone, Nicolas Dupre, Thierry Brousse, Patrick Rozier, Patrice Simon, Katsuhiko Naoi

    International Conference on Advanced Capacitor 2016 2016年6月

  67. Detailed Analysis on Carbon-Nested Ultrafast nano-LiFePO4 Prepared by Ultracentrifugation for Hybrid EES

    Kazuaki Kisu, Etsuro Iwama, Shota Nakashima, Yuki Sakai, Yuki Orikasa, Wako Naoi, Philippe Leone, Nicolas Dupre, Thierry Brousse, Patrick Rozier, Patrice Simon, Katsuhiko Naoi

    The 56th Battery Symposium Japan (International Session) 2015年11月

  68. Detailed Analysis on Carbon-Nested Ultrafast nano-LiFePO4 Prepared by Means of Ultracetrifugation for Hybrid EES

    Kazuaki Kisu, Etsuro Iwama, Shota Nakashima, Yuki Sakai, Yuki Orikasa, Wako Naoi, Philippe Leone, Nicolas Dupre, Thierry Brousse, Patrick Rozier, Patrice Simon, Katsuhiko Naoi

    66th annual meeting of International Electrochemical Society 2015年10月

  69. Ultrafast Nanocrystalline Li3V2-xAlx(PO4)3/Multi-Walled Carbon Nanotube Composites for Hybrid Capacitor Prepared via Ultra-Centrifugation Treatment

    Kazuaki Kisu, Naohisa Okita, Masanori Muramatsu, Etsuro Iwama, Wako Naoi, Katsuhiko Naoi

    4th International Symposium on Enhanced Electrochemical Capacitors 2015年7月

  70. 高出力化に向けたLiMn0.792Fe0.198Mg0.010PO4/SGCNT複合体の正極特性

    中島翔太, 大西亘, 木須一彰, 岩間悦郎, 直井和子, 直井勝彦

    第55回電池討論会 2014年11月

  71. ナノ結晶Li3V2-xAlx(PO4)3/カーボン複合体の高出力リチウムイオン電池正極特性

    村松将典, 木須一彰, 篠田万里子, 沖田尚久, 直井和子, 直井勝彦

    第55回電池討論会 2014年11月

  72. Ultrafast Li3V2(PO4)3 Embedded into Surface Graphene Layers of Carbon Nano-fibers for SuperRedox Capacitor

    Naohisa Okita, Kazuaki Kisu, Wako Naoi, Katsuhiko Naoi

    65th Annual Meeting of the International Society of Electrochemistry 2014年9月

  73. UC-Treated nc-Li3V2(PO4)3/Nano Carbon Composites For SuperRedox Capacitor

    Kazuaki Kisu, Yuki Sato, Mariko Shinoda, Naohisa Okita, Wako Naoi, Katsuhiko Naoi

    The 7th Asian Conference on Electrochemical Power Sources 2013年11月

  74. 超遠心ナノハイブリッド技術を用いたナノ結晶 Li3V2(PO4)3/カーボン複合体のスーパーレドックスキャパシタ正極特性

    篠田万里子, 木須一彰, 沖田尚久, 佐藤祐希, 直井和子, 直井勝彦

    第54回電池討論会 2013年10月

  75. 超遠心ナノハイブリッド技術を用いたナノ結晶SnO2/カーボン複合体の作製及びリチウムイオン二次電池負極特性評価

    木須一彰, 飯島みな美, 斎藤守弘, 折笠有基, 直井和子, 直井勝彦

    第54回電池討論会 2013年10月

  76. Ultrafast nc-Li3V2(PO4)3 Composited with Carbon NanoFibers for SuperRedox Capacitor

    Kazuaki Kisu, Yuki Sato, Mariko Shinoda, Wako Naoi, Katsuhiko Naoi

    The 2013 International Conference on Advanced Capacitors 2013年5月

  77. Nanohybridization of nc-SnO2 with Hollow-Structured Carbon for High Performance Li-ion Battery Anode

    Kazuaki Kisu, Minami Iijima, Yuki Nagano, Junichi Miyamoto, Wako Naoi, Katsuhiko Naoi

    222nd ECS Meeting The Electrochemical Society of Japan - 2012 Fall Meeting 2012年10月

  78. Liイオン電池負極材料「酸化スズ炭素ナノ複合体」の作製と評価

    木須一彰, 石本修一, 飯島みな美, 長野有紀, 直井勝彦

    第52回電池討論会 2011年10月

  79. 大容量・高サイクル「ナノ結晶SnO2/炭素複合負極材料」の電気化学特性

    飯島みな美, 石本修一, 宮良健吾, 木須一彰, 長野有紀, 直井勝彦

    2011年電気化学秋季大会 2011年9月

  80. リチウムイオン電池負極材料「酸化スズ炭素ナノ複合体」の合成および評価

    木須一彰, 石本修一, 宮良健吾, 飯島みな美, 直井勝彦

    電気化学会第78回大会 2011年3月

  81. リチウムイオン電池負極材料「酸化スズ/炭素ナノ複合体」の作製 および電気化学評価

    宮良健吾, 石本修一, 木須一彰, 直井勝彦

    第51回電池討論会 2010年11月

  82. 単斜晶系チタン酸のイオン交換性

    粟野幸雄, 八幡喜代志, 佐藤慶彦, 木須一彰

    化学系学協会東北大会 2010年9月

︎全件表示 ︎最初の5件までを表示

産業財産権 3

  1. ION CONDUCTOR CONTAINING HIGH-TEMPERATURE PHASE OF LiCB9H10 AND METHOD FOR PRODUCING SAME

    Keita Noguchi, Genki Nogami, Yutaka Matsuura, Sangryun Kim, KISU Kazuaki, Shin-ichi Orimo

    産業財産権の種類: 特許権

  2. COMPOSITION FOR ELECTROLYTE FOR CALCIUM BATTERY, ELECTROLYTE FOR CALCIUM BATTERY, AND CALCIUM BATTERY

    Kazuaki KISU, SangryunKIM, Shin-ichi ORIMO

    産業財産権の種類: 特許権

  3. 電解質、二次電池及びコン ポジット材

    藪浩, 折茂慎一, 木須一彰, グレワルマンジットシン

    産業財産権の種類: 特許権

共同研究・競争的資金等の研究課題 6

  1. 多価イオン伝導特性を導く指導原理:配位環境制御による水素化物分子結晶の創成

    木須 一彰, 岩間 悦郎

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    研究種目:Grant-in-Aid for Scientific Research (B)

    研究機関:Tohoku University

    2022年4月 ~ 2026年3月

  2. 錯体水素化物固体電解質と硫黄/炭素電極材料間における界面挙動の解明と制御

    木須 一彰

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

    研究種目:Grant-in-Aid for Early-Career Scientists

    研究機関:Tohoku University

    2019年4月 ~ 2022年3月

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    エネルギー貯蔵デバイスの高エネルギー密度化が求められている。負極材料として最も高い理論容量を有する「リチウム金属」と、正極材料として高い理論容量を有する「硫黄」から成るリチウム硫黄電池は次世代電池の中で最大の理論重量エネルギー密度を有しているが、それらの電極材料に対して高い安定性を有する電解質が登場していないことが、この電池の実現を妨げる要因となっている。錯体水素化物は、リチウム硫黄電池の電解質として相応しい固体電解質である。相応しい最大の理由は、強い還元力を有する錯体水素化物が、反応活性が非常に高いリチウム金属に対して高い安定性を有すると期待されるためである。本研究では、錯体水素化物固体電解質/リチウム負極および硫黄炭素複合体正極の界面における化学的/電気化学的安定性の評価に加え、界面に生成し得る新規の層について、その生成条件や生成メカニズムを検討し、安定な充放電サイクル寿命を有する全固体リチウム硫黄電池の実現を目指した。2019年度は低温で比較的高いイオン伝導度を有する錯体水素化物固体電解質であるLi4(BH4)3Iを用い、リチウム金属負極に対する化学的/電気化学的安定性の評価およびリチウム硫黄電池の作製/評価を行った。錯体水素化物固体電解質のリチウム金属負極に対する安定性について、リチウム金属箔を両極に用いた対称セルの充放電試験によって評価した。電圧応答の平坦性は安定性の指標となっており、錯体水素化物LiBH4はこれまでに報告されている固体電解質の中で最も高い安定性を有する固体電解質の一つであることが明らかとなった。この研究を通して、錯体水素化物を固体電解質として用いたリチウム硫黄電池の充放電サイクルにおける容量劣化は負極リチウムに由来しておらず、正極層内の劣化に由来していることが示された。

  3. 高容量・高電圧作動ハイブリッドキャパシタに関する研究

    宮本 淳一, 直井 勝彦, 岩間 悦郎, 木須 一彰

    2017年4月1日 ~ 2020年3月31日

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    最終年度は平成30年度に決定した負極材料にLi3VO4(LVO)/多層カーボンナノチューブ複合体、正極材料にLi3V2(PO4)3:(LVP)を使用し、高電圧作動キャパシタの構築およびその性能について検討した。その結果電圧としては2.0~3.0Vで動作可能であり、これまでのキャパシタより高電圧作動可能であることを確認した。ただしサイクル劣化が1000サイクル以降徐々に進行することが判明した。その原因を各種分光法により劣化試料を分析したところ、負極表面に微量のバナジウムを検出し、そのバナジウムを中心に電解液分解物が表面堆積物を形成していることがわかった。この表面堆積物は活物質を被覆する表面固体皮膜(SEI)となり、そのためにサイクル劣化が生じているのではないかと考えている。さらにこのSEI中にフッ化リチウムを含むことがわかり、電解液中にフッ化水素が存在していることを示唆している。したがって、サイクル劣化の主要因は正極あるいは負極に含まれるバナジウムがHFにより溶出し、それが負極表面で堆積し、触媒として作用することで電解液を分解し、アルキル炭酸リチウムの生成を促進し電極被覆し、Liイオン拡散を阻害するためと考えられた。この原因解明のため、現在バナジウムが正・負極いずれから溶出しているのかを調査している。バナジウム溶出の抑制には電極活物質ナノ結晶を酸化物など各種無機物によりコートすることを検討している。 本研究期間の成果としては既に実用化されている両極活性炭である電気二重層キャパシタや、負極にチタン酸リチウムを用いたナノハイブリッドキャパシタより更に高電圧作動可能なキャパシタの構築を検討した。その結果、負極にLVO正極にLVPを用いることで目標である高電圧化が達成可能であることを示した。今後サイクル特性の劣化を抑えることでさらに実用化レベルに近づくと考えられる。

  4. 結晶化度・欠陥制御されたリン酸塩系正極材料の高速充放電反応メカニズム解明 競争的資金

    木須一彰

    2017年4月 ~ 2019年3月

  5. 次世代ハイブリッドキャパシタに関する研究

    直井 勝彦, 木須 一彰, 岩間 悦郎, 宮本 淳一

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    研究種目:Grant-in-Aid for Scientific Research (A)

    研究機関:Tokyo University of Agriculture and Technology

    2013年4月1日 ~ 2018年3月31日

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    電気二重層キャパシタ(EDLC)は10 Wh/L程度とエネルギー密度が小さく、小・中型用途に限られている。キャパシタのエネルギー密度が現行の2~3倍になると、再生可能エネルギーの蓄電用途に使用可能となる。本研究では、これまでにないカテゴリーのキャパシタ高性能化を目指し、ナノ酸化物/ナノ炭素材料複合体電極を創製し、EDLC級の高速化を達成した。さらに、創製した複合電極を活性炭や他の複合電極と組み合わせ、次世代ハイブリッドキャパシタを構築し、性能の検証を行った。実験室レベルのラミネートセルによる試験結果では、EDLC比較でエネルギー密度3倍以上(活物質重量当たり)を達成可能であることを確認した。

  6. リン酸塩系カーボン複合電極材料における高速電極反応の解明と高性能化 競争的資金

    木須一彰

    2015年10月 ~ 2017年3月

︎全件表示 ︎最初の5件までを表示

社会貢献活動 5

  1. 企業との共同研究について

    突破力の養成 異文化間でのコミュニケーション力

    2012年9月 ~ 2012年9月

  2. "脱リチウム"電池時代到来 エネルギー密度10倍も視野に

    日経エレクトロニクス4月号

    2022年3月20日 ~

  3. カルシウムイオン電池用の新電解質

    日経サイエンス 2021年7月号

    2021年5月25日 ~

  4. カルシウムイオン電池安定動作 電解質材料、フッ素使わず

    日経産業新聞 7面

    2021年4月26日 ~

  5. カルシウム電解質開発 東北大など 4Vでも酸化安定

    日刊工業新聞 23面

    2021年4月8日 ~