Synthesis of LiFePO_4 in situ vapor-grown carbon fiber (VGCF) composite cathode material via microwave pyrolysis chemical vapor deposition  

作　　者：DENG Fei ZENG XieRong ZOU JiZhao HUANG JianFeng SHENG HongChao XIONG XinBo QIAN HaiXia LI XiaoHua 

机构地区：[1]School of Materials Science and Engineering, Northwestern Polytechnical University, Xi' an 710072, China [2]College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China [3]Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, China

出　　处：《Chinese Science Bulletin》2011年第17期1832-1835,共4页

基　　金：supported by the National Natural Science Foundation of China (50672059)

摘　　要：One of the most important factors that limits the use of LiFePO 4 as cathode material for lithium ion batteries is its low electronic conductivity.In order to solve this problem,LiFePO 4 in situ vapor-grown carbon fiber (VGCF) composite cathode material has been prepared in a single step through microwave pyrolysis chemical vapor deposition.The phase,microstructure,and electrochemical performance of the composites were investigated.Compared with the cathodes without in situ VGCF,the initial discharge capacity of the composite electrode increases from 109 to 144 mA h g-1 at a 0.5-C rate,and the total electric resistance decreases from 538 to 66.The possible reasons for these effects are proposed.One of the most important factors that limits the use of LiFePO4 as cathode material for lithium ion batteries is its low electronic conductivity. In order to solve this problem, LiFePO4 in situ vapor-grown carbon fiber （VGCF） composite cathode material has been prepared in a single step through microwave pyrolysis chemical vapor deposition. The phase, microstructure, and electro- chemical performance of the composites were investigated. Compared with the cathodes without in situ VGCF, the initial discharge capacity of the composite electrode increases from 109 to 144 mAh g^-1 at a 0.5-C rate, and the total electric resistance decreases from 538 to 66 Ω The possible reasons for these effects are proposed.

关 键 词：LIFEPO4 气相生长碳纤维 化学气相沉积法 复合阴极材料 VGCF 微波热解 原位 合成 

分 类 号：TM912[电气工程—电力电子与电力传动]