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电化学(中英文) ›› 2007, Vol. 13 ›› Issue (2): 136-139.  doi: 10.61558/2993-074X.1795

• 研究论文 • 上一篇    下一篇

Li_(1-x)M_xFePO_4阴极材料的合成和电化学性能

李婷;钱江峰;曹余良;杨汉西;艾新平;   

  1. 武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院 湖北武汉430072,湖北武汉430072,湖北武汉430072,湖北武汉430072,湖北武汉430072
  • 收稿日期:2007-05-28 修回日期:2007-05-28 出版日期:2007-05-28 发布日期:2007-05-28

Electrochemical Performance of Li_(1-x)M_xFePO_4 Cathode Materials Synthesized by Polymer Pyrolysis Route

LI Ting,QIAN Jiang-feng,CAO Yu-liang,YANG Han-xi,AI Xin-ping   

  1. (Department of Chemistry,Wuhan University,Wuhan 430072,China
  • Received:2007-05-28 Revised:2007-05-28 Published:2007-05-28 Online:2007-05-28

摘要: 应用聚丙烯酸盐热解法合成掺杂Cr3+或Mg2+、Mn2+、Ni2+的LiFePO4正极材料,研究掺杂离子对目标化合物电化学性质的影响.XRD和SEM实验表明,该材料微米级颗粒是由约200nm的粒子团聚而成的,具有橄榄石型结构,且未出现杂质相.电化学测试表明,掺Cr3+的LiFePO4在高倍率(3C)放电下的首周放电容量为97mAh/g,相当于0.15C率容量的66%,其循环性能优异,充分显示离子掺杂能显著改善材料的高倍率放电性能和循环性能.

关键词: LiFePO4, 正极材料, 离子掺杂, 电化学性能

Abstract: Olivine Li1-xMxFePO4(M=Cr3+、Mg2+、Mn2+、Ni2+)were synthesized by a polyacrylates-pyrolysis route.The structural and electrochemical properties of the as-synthesized cathode materials were investigated by powder X-ray diffraction(XRD),scanning electron microscopy(SEM),and electrochemical charge/discharge cycling.The results indicate that the metallic ions doped at low concentration do not affect the crystalline structure of the material,but considerably improve the rate capability and cycle performance of LiFePO4 at high rate.

Key words: LiFePO4, cathode material, ion doping, electrochemical performance

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