Co^(3+)、F^-掺杂LiMn_2O_4的电化学性能研究  

Study on the electrochemical performance of LiMn_2O_4 doped with Co^(3+)and F^-

作　　者：潘磊[1] 田建华[1] 单忠强[1] 刘浩杰[2] 吴峰[3] 

机构地区：[1]天津大学化工学院,天津300072 [2]中国电子科技集团公司第十八研究所,天津300381 [3]北京理工大学环境与化工学院,北京100081

出　　处：《电源技术》2007年第6期450-452,共3页Chinese Journal of Power Sources

基　　金：国家自然科学基金(90206043);国家"973"计划资助项目(202CB211800)

摘　　要：采用以柠檬酸为络合剂的溶胶-凝胶法合成了复合掺杂Co、F两种元素的锂离子蓄电池正极材料LiMn2-xCox-O4-yFy。采用X射线衍射(XRD)、透射电子显微镜(TEM)及充放电循环等方法分析研究了不同掺杂量对材料结构、粒径及电化学性能的影响。结果表明,合成的材料具有良好的尖晶石结构和性能,其中LiMn1.88Co0.12O3.8F0.2在55℃条件下的循环性能已经接近室温下的测试结果。LiMn2xCoxO4-yFy were synthesized by sol - gel method of using citric acid as a chelating agent. The effects of cobalt and fluodn quantity on the structure, particle diameter and electrochemical properties of LiMn2-xCoxO4-yFy were investigated by XRD, TEM and charge-discharge cycling methods. The results show that the prepared sampies have spinel structure, and the cycle performance of LiMn1.88Co0.12O3.8F0.2 at elevated temperature （ 55 ℃ ） is similar to that at room temperature.

关 键 词：锂离子蓄电池 LiMn2-xCoxO4-yFy 溶胶凝胶法 高温循环性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]