Structural Characterization of LiFePO_4 based Ionic Conductivity Synthesized at Low temperatures

低温合成LiFePO_4基离子电导率的结构表征

• 批准号: 20360288
• 负责人: WASEDA Yoshio
• 金额: $ 11.48万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20360288/
• 关键词: 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

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.

橄榄石型LiFePO_4是一种很有前途的锂离子电池正极材料，但其电化学性能与结构的关系尚不清楚。本研究采用液相和固相法合成了LiFePO_4颗粒，并利用原位X射线吸收光谱（In-situ X-ray absorption spectroscopy，XPS）研究了LiFePO_4颗粒在充放电循环过程中的充放电性能和Fe的化学状态。发现LiFePO_4中Fe的化学状态与充放电过程有关。研究了热处理对多元醇法制备的LiFePO_4颗粒结构和电化学性能的影响。通过适当的热处理，提高了其充放电容量。

项目成果

溶液場における異なる構造をもっ酸化鉄粒子の生成過程

溶液场中不同结构氧化铁颗粒的生成过程

• 发表时间: 2009
• 作者: R.Endo;S.Maeda;M.Kuwahara;Y.Kobayashi;M.Susa;鈴木茂
• 通讯作者: 鈴木茂

Characterization of Reaction of Green Rust with Foreign Ions using X-ray Absorption Fine Structure

利用 X 射线吸收精细结构表征绿锈与外来离子的反应

• 发表时间: 2008
• 期刊: Zairyo-to-Kankyo 57
• 作者: 石原博哉;宮嶋圭太;本多沢雄;橋本忍;岩本雄二;S. Suzuki
• 通讯作者: S. Suzuki

水溶液中でのGreen Rustの酸化による酸化鉄およびオキシ水酸化鉄の形成の評価

水溶液中绿锈氧化形成氧化铁和羟基氧化铁的评价

• 发表时间: 2009
• 作者: 井之上勝哉;篠田弘造;鈴木茂;早稲田嘉夫
• 通讯作者: 早稲田嘉夫

Changes in chemical state and local structure of green rust by addition of copper sulphate ions

• DOI: 10.1016/j.corsci.2008.02.022
• 发表时间: 2008-06
• 期刊: Corrosion Science
• 影响因子: 8.3
• 作者: Shigeru Suzuki;K. Shinoda;Masugu Sato;S. Fujimoto;M. Yamashita;H. Konishi;T. Doi;T. Kamimura;K. Inoue;Y. Waseda

Reduction of Copper Ions in Green Rust Suspension and Oxidation of Green Rust Containing Metallic Copper

• DOI: 10.2320/matertrans.maw200818
• 发表时间: 2008-09
• 期刊: Materials Transactions
• 影响因子: 1.2
• 作者: K. Inoue;K. Shinoda;Shigeru Suzuki;Y. Waseda