化学学报 ›› 2009, Vol. 67 ›› Issue (20): 2275-2278. 上一篇    下一篇

研究论文

锂电池中低成本碳包覆磷酸铁锂正极材料的合成及其性能

徐土根a,b,c 王连邦*,a 李 晟a 马淳安a   

  1. (a浙江工业大学 化学工程与材料学院 绿色化学合成技术国家重点实验室培育基地 杭州 310032) (b杭州师范大学材料与化学化工学院 杭州 310036) (c杭州师范大学有机硅化学及材料技术教育部重点实验室 杭州 310012)
  • 收稿日期:2009-03-03 修回日期:2009-04-30 出版日期:2009-10-28 发布日期:2009-06-19
  • 通讯作者: 王连邦 E-mail:wanglb99@zjut.edu.cn
  • 基金资助:

    973计划项目前期研究专项(2007CB216409);国家自然科学基金(20506024);浙江省博士后基金(2007327)

Synthesis of Low Cost LiFePO4/C Cathode Material for Li-ion Battery

Xu, Tugen a,b,c   Wang, Lianbang*,a    Li, Shenga    Ma, Chunan a   

  1. (a State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032) (b College of Materials and Chemical Engineering, Hangzhou Normal University, Hangzhou 310036) (c Educational Ministry Key Laboratory of Organosilicon Chemistry and Material Technology, Hangzhou Normal University, Hangzhou 310012)
  • Received:2009-03-03 Revised:2009-04-30 Online:2009-10-28 Published:2009-06-19

磷酸铁锂作为动力锂离子电池的正极材料正逐渐走向市场. 以Li3PO4, FePO4, Fe粉以及乙醇为原料, 采用高温热分解方法成功地制得乙醇碳包覆的LiFePO4正极材料. 实验结果表明, 该LiFePO4/C材料颗粒均匀, 分散性好, 粒径大约在200 nm~1 μm之间, 颗粒表面被碳包覆, 颗粒之间由碳纤维连接. 该正极材料首次放电容量达137 mAh•g-1, 首次充放电库仑效率在95%以上, 50次循环后, 放电容量基本不衰减, 显示出良好的循环稳定性和可逆性. 本研究降低了锂离子电池的生产成本, 显示了良好的工业化应用前景.

关键词: 锂离子电池, 动力电池, 正极材料, 磷酸铁锂, 碳包覆

LiFePO4 is being used as the cathode material for Li-ion batteries of electric vehicle (EV) because of low cost and high safety. In this work, a carbon-coated LiFePO4 was synthesized by a thermal decomposition method using Li3PO4, FePO4, Fe powder and ethanol as the raw materials. Experimental results showed that LiFePO4/C particles were evenly distributed with the sizes of 200 nm~1 μm, the surface of particles was coated by carbon, and the particles were linked together by carbon fibers. The first discharge capacity of sample reached 137 mAh•g-1 and the first columbic efficiency was over 95%. After 50 cycles, the discharge capacity still remained unchanged, which indicated the good cycle capability and reversibility. Our research lowered the cost of Li-ion batteries and provided a feasible application in Li-ion batteries for industrial production.

Key words: lithium ion battery, cathode material, LiFePO4, carbon coated