聚苯胺包覆的LiFePO_4电化学性能研究  

An Investigation of Electrochemical Performance of Polyaniline Coated LiFePO_4 Materials

作　　者：易晓华[1] 雷钢铁[1] 汪磊[1] 周姬[1] 李朝晖[1] 高德淑[1] 

机构地区：[1]湘潭大学化学学院环境友好化学与应用省部共建教育部重点实验室,湘潭411105

出　　处：《材料导报》2008年第11期139-141,共3页Materials Reports

基　　金：湖南省教育厅优秀青年项目(No.07B076);湘潭大学博士科研启动费项目(06KZ/KZ08012)

摘　　要：采用固相法合成了锂离子电池正极材料LiFePO4。为了改进LiFePO4的高倍率充放电性能,采用原位聚合的方法合成了一系列聚苯胺-LiFePO4(PAn-LiFePO4)复合正极材料。通过扫描电子显微镜(SEM)观察了样品的形貌。交流阻抗测试表明聚苯胺的包覆降低了LiFePO4电极的电化学反应阻抗。充放电测试表明PAnLiFePO4复合材料的放电容量更高,循环性能更好。Lithium iron phosphate （LiFePO4） cathode material for rechargeable lithium-ion batteries is synthesized by a solid-state reaction. In order to improve the high rate charge-discharge capability, a series of polyaniline-LiFePO4 （PAn-LiFePO4） composites are synthesized by in-situ polymerization. The micromorphology of samples is observed by SEM. AC impedance measurements showed that the coating of polyaniline significantly decreases the electrochemical reaction resistance of LiFePO4 electrodes. Charge-discharge tests show that PAn-LiFePO4 composites have higher discharge capacity and better cycling performance.

关 键 词：LIFEPO4 聚苯胺 原位聚合 

分 类 号：TM912.2[电气工程—电力电子与电力传动] O633.21[理学—高分子化学]