共沉淀法制备LiFePO_4/C复合材料的结构与性能  

Structure and Performance of LiFePO_4/C Composite Prepared by Co-precipitation Method

作　　者：习小明[1] 刘鲁平 李运姣 彭明 

机构地区：[1]中南大学冶金科学与工程学院

出　　处：《矿冶工程》2007年第6期76-78,共3页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(50474048);教育部新世纪优秀人才支持计划资助

摘　　要：为了获得性能优异的LiFePO4/C复合材料,通过共沉淀法合成前躯体,用不同的方式进行碳包覆,制得橄榄石型LiFePO4/C复合材料。用XRD和SEM等手段对产物的结构和形貌进行研究,通过充放电实验测试其电化学性能。结果表明,在共沉淀过程中直接加入葡萄糖所制得的LiFePO4/C复合材料样品颗粒粒径最小,电化学性能最好,在0.1 C倍率下,首次放电比容量为152 mAh/g。In order to obtain LiFePO4/C with excellent electrochemical performance,a co-precipitation method was used to synthesize precursor,which was coated with carbon by several different methods.Thereby LiFePO4/C powders were obtained.The crystalline structures and morphology of the powders were investigated by Xray diffraction and scanning electron microscopy.Its electrochemical properties were investigated by charge-discharge tests.The results showed that the sample,synthesized by adding C6H12O6 during co-precipitation,had the smallest particle size and the best electrochemical performance.Its first discharge specific capacity at a multiplying factor of 0.1 C is 152 mAh/g.

关 键 词：锂离子电池 正极材料 LIFEPO4 LiFePO4复合材料 共沉淀 

分 类 号：TM912[电气工程—电力电子与电力传动]