【作者】 王建梅； 蔡飞鹏； 杨改； 王波； 胡素琴；

【Author】 Wang jianmei~*,Cai feipeng,Yang gai,Wang bo,Hu suqin (Energy Research Institute of Shandong Academy of Sciences,Jinan 250014,China)

【机构】 山东省科学院能源研究所；

【摘要】 以C₂H₂为碳源,Fe为催化剂,采用催化化学气相沉积法（CCVD）在Li₂CO₃和纳米FePO₄原料上一步合成LiFePO₄/C复合材料。对比考察了碳热还原法、催化气相沉积法制备的LiFePO₄/C正极材料与金属锂组成的实验室电池的电化学性能,结果表明,后者具有较好的电化学性能,特别是在高倍率条件下（5-10C）容量保持率高于前者。SEM测试发现,C₂H₂在反应过程中裂解成碳并组装成碳纳米纤维贯穿于LiFePO₄材料中,改善了磷酸铁锂电池的大电流充放电性能。更多还原

【Abstract】 A vapor-grown carbon fiber/graghite carbon-coated LiFeP04 composite has been prepared in one step through a gas-solid reaction in a fluid bed.In this paper,we synthesized another LiFePO4 composite material by carbothermal reduction method as contrast sample.The electrochemical property of the two kind of materials were characterized by electrochemical measurements.The result shows,the material by CCVD method gains better high-rate performance,and this maybe due to some carbon nano fibers throughout the LiFePO4 composite material which can highly promote the material’s electrical conductivity.更多还原