| Project/Area Number |
20360288
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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 |
Physical properties of metals
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| Research Institution | Tohoku University |
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Principal Investigator |
WASEDA Yoshio Tohoku University, 多元物質科学研究所, 教育研究支援者 (00006058)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Shigeru 東北大学, 多元物質科学研究所, 教授 (40143028)
SHINODA Kozo 東北大学, 多元物質科学研究所, 准教授 (10311549)
FUJIEDA Shun 東北大学, 多元物質科学研究所, 助教 (60551893)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2010: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2009: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2008: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
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| Keywords | リン酸鉄リチウム / 酸化還元 / 構造解析 / X線吸収分光法 / X線構造解析 / X線吸収分光 / 原子配列 / 化学状熊解析 / 化学状態解析 / オキシ水酸化鉄 |
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| Research Abstract |
Olivine-type LiFePO_4 is one of the promising cathode materials for Li-ion batteries, but the relationship between its electrochemical properties and structure is unclear. In this study, LiFePO_4 particles were synthesized through liquid and solid processes, and their charging/discharging properties and the Fe chemical state were investigated In-situ X-ray absorption spectroscopy at the Fe-K edge for obtaining the chemical variation of LiFePO_4 particles during charge/discharge cycles. The chemical state of Fe in LiFePO_4 particles has been found to correlate with the charging and discharging process. The effect of heat treatment was examined with respect to the structure and electrochemical properties of LiFePO_4 particles prepared by the polyol process. The appropriate heat treatment showed the improvement of their charging and discharging capacity.
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