| Project/Area Number |
10555297
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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 | 展開研究 |
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| Research Field |
工業物理化学
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
UCHIDA Isamu New Industry Creation Hatch Center, Tohoku University, Professor, 未来科学技術共同研究センター, 教授 (50005302)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUKI Kenzou Faculty of Engineering, Yamagata University, Professor, 工学部, 教授 (70006998)
ITOH Takashi Graduate School of Engineering, Tohoku University, Research Associate, 大学院・工学研究科, 助手 (40302187)
NISHIZAWA Matsuhiko Graduate School of Engineering, Tohoku University, Lecturer, 大学院・工学研究科, 講師 (20273592)
URUSHIBATA Hiroaki Advanced Technology Center, Mitsubishi Electric Company, Research Manager, 先端技術総合研究所・エネルギー変換技術部, 電気化学グループマネージャー(研究職)
NISHINA Tatsuo Faculty of Engineering, Yamagata University, Associate Professor, 工学部, 助教授 (60172673)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥13,600,000 (Direct Cost: ¥13,600,000)
Fiscal Year 1999: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1998: ¥9,800,000 (Direct Cost: ¥9,800,000)
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| Keywords | Lithium ion battery / Battery material / Layered structure / Insertion / Extraction / Intercalation reaction / Microelectrode / Citrate precursor / in situ measurements / 正極活物質 / 負極活物質 / インターカレーション / 固相内レドックス過程 / リチウムイオンの拡散係数 / はく膜電極 |
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| Research Abstract |
The present research project has aimed development of new materials for the lithium-ion secondary battery, which is applicable to electric vehicles, based on two novel techniques, one being the citrate precursor method for material preparation and the other a microelectrode technique for electrochemical characterization of powdered battery materials.
(1) Under collaboration, Yamagata group obtained lithium nickelate and spinel-related lithium manganese oxides with good cyclability by the modified citrate method, which enabled us to prepare systematically the multi-components oxides with micro-level tailoring and atomic-level homogeneity.
(2) Tohoku group has developed microelectrode techniques which are very versatile in electrochemical characterization and rapid searching tailored samples even in a small quantity of micro-meter size particles. In-situ observation of particle splitting due to the mechanical instability accompanied by the insertion/extraction of lithium ions, high potential (〜5V) voltammetry to examine the electrochemical stability of the particle in organic solutions, determination of diffusion coefficients of lithium ions in the solid phase by AC and potential step method, and in-situ Raman spectroscopy and in-situ conductivity measurements during insertion of lithium ions with micro-array electrode technique also have been carried. Data thus obtained were feedbacked to the partners and effectively utilized in further R&D.
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