高密度LiFePO4／C正极材料的合成其及电化学性能研究  

Study on synthesis and electrochemical performance of high tap density LiFePO_4/C as cathode material

作　　者：常照荣[1] 吕豪杰[1] 汤宏伟[1] 付小宁[2] 

机构地区：[1]河南师范大学化学与环境科学学院,河南新乡453007 [2]新乡学院化学与环境工程学院,河南新乡453007

出　　处：《功能材料》2009年第4期618-620,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20671031)

摘　　要：以Li2CO3为锂源,葡萄糖为C源,与高密度前驱体FePO4混合,采用高温固相反应法合成高密度的锂离子电池正极材料LiFePO4/C复合材料。采用X射线衍射、电子扫描显微镜和恒电流充放电对制得的LiFPO4进行了研究。结果表明,合成材料结晶完整,为均一的橄榄石型结构。C的含量在很大程度上影响LiFePO4的密度,当C的含量为3.0%(质量分数)时,所制正极材料LiFePO4/C的振实密度可达到2.14g/cm3,0.1C放电容量为121.5mAh/g,体积比容量达到260.0mAh/V。High density LiFePO4/C composite cathode material was synthesized by a solidstate reaction in an inert atmosphere which used Li2CO3, glucose and high-density precursor FePO4. The LiFePO4/C samples were characterized by X-ray difraction, scanning electron microscope and electrochemicaI performance testing. The results indicate that the cathode material is well crystallized,homogeneous olivine-type phase. The content of C is an important factor to influence the density of LiFePO4. With the C content of 3.0wt%, the tap density of LiFe- PO4/C reaches 2. 14g/cm^3, and its discharge capacity approximates 121.5mAh/g and 260.0mAh/V at 0. 1C rate.

关 键 词：高密度 正极材料 LIFEPO4/C复合材料 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]