2011 Fiscal Year Final Research Report
Development of high power density electrode system on the basis ofconstruction of ionic conduction channel of hierarchic structure
| Project/Area Number |
21360479
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Energy engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
YAO Takeshi 京都大学, 大学院・エネルギー科学研究科, 教授 (50115953)
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| Co-Investigator(Kenkyū-buntansha) |
HIBINO Mitsuhiro 京都大学, 大学院・エネルギー科学研究科, 准教授 (20270910)
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| Project Period (FY) |
2009 – 2011
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| Keywords | エネルギー全般 / 複合材料・物性 / 固体イオニクス / リチウムイオン電池 / 空気電池 / 拡散係数 |
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| Research Abstract |
Lithium diffusion coefficient in maghemite(γ-Fe2O3) was first and electrochemically determined. A composite material of the maghemite nanoparticles and ketjenblack, which was a structural and electrically conducting medium, was fabricated as hierarchically structural material possessing nano-and meso-scale ionic conduction channel. It was examined as cathode of lithium-air battery and exhibited good performance in terms of both reversibility and cyclability.
Iron-based layer compounds CaFeO2 and SrFeO2 were found to serve as anodes of lithium ion battery through conversion reactions. In particular, CaFeO2 showed higher specific capacity than expected on the basis on the conversion reaction, which was probably attributed to alloying reaction of calcium and lithium.
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