LiとNaバッテリーのための新規酸水素化物電極の合成と解析
Project/Area Number |
17F17341
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Research Category |
Grant-in-Aid for JSPS Fellows
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Allocation Type | Single-year Grants |
Section | 外国 |
Research Field |
Inorganic chemistry
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Research Institution | Kyoto University |
Principal Investigator |
陰山 洋 京都大学, 工学研究科, 教授 (40302640)
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Co-Investigator(Kenkyū-buntansha) |
BROUX THIBAULT 京都大学, 工学(系)研究科(研究院), 外国人特別研究員
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Project Period (FY) |
2017-11-10 – 2020-03-31
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Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2019: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2018: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2017: ¥1,000,000 (Direct Cost: ¥1,000,000)
|
Keywords | high pressure synthesis / oxyhydride |
Outline of Annual Research Achievements |
After our recent discover of LnHO with Ln = Sm, Gd, Tb, Dy, Ho, and Er, the hydride (H-) conductivity has been measured. It is found that, despite its “stoichiometric” composition, the anion-ordered phase (Ln = La, Nd) exhibits hydride conductivity (e.g., 2.3 × 10-S S cm-1 for NdHO at 300 °C), while the anion-disordered one (Ln = Gd, Er) is an ionic insulator. The systematic structural analysis combined with computational calculations has revealed the indirect interstitial mechanism, where H- anions migrate between the tetrahedral and octahedral sites through a triangular Ln3 bottleneck expanded by the anion order, with a critical bottleneck radius of 1.18 A. Besides that, another series of materials have been developed by exploiting hydride anions (H-) properties to construct a soft anion-sublattice together with chalcogens, in a previously unexplored antiperovskites series. Despite a large size variation for each Ch and M, the M3HCh antiperovskites (M = Li, Na; Ch = Chalcogen) adopt the ideal cubic structure (except orthorhombic Na3HS). Unlike traditional perovskites, such robustness of cubic phase originates from the extreme size-flexibility/polarizability of H-anions. Theoretical and experimental studies reveal low migration barriers for Li+/Na+ transport and high ionic conductivity, possibly promoted by a soft phonon mode associated with the rotational motion of HM6 octahedra in this soft cubic lattice. Hydride-based antiperovskites are thus offering a new direction for material design to explore.
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Research Progress Status |
令和元年度が最終年度であるため、記入しない。
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Strategy for Future Research Activity |
令和元年度が最終年度であるため、記入しない。
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Report
(3 results)
Research Products
(3 results)
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[Journal Article] Chemical Pressure-Induced Anion Order-Disorder Transition in LnHO Enabled by Hydride Size Flexibility2018
Author(s)
Hiroki Yamashita, Thibault Broux, Yoji Kobayashi, Fumitaka Takeiri, Hiroki Ubukata, Tong Zhu, Michael A. Hayward, Kotaro Fujii, Masatomo Yashima, Kazuki Shitara, Akihide Kuwabara, Taito Murakami, Hiroshi Kageyama
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Journal Title
Journal of the American Chemical Society
Volume: 140
Issue: 36
Pages: 11170-11173
DOI
Related Report
Peer Reviewed / Int'l Joint Research