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无机材料学报

无机材料学报

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掺杂球形Li1+xV3O8的制备及其电化学性能研究

高剑; 姜长印; 应皆荣; 万春荣   

  1. 清华大学核能与新能源技术研究院材料化学实验室, 北京 102201
  • 收稿日期:2004-03-16 修回日期:2004-05-25 出版日期:2005-03-20 网络出版日期:2005-03-20

Preparation and Electrochemical Properties of Doped Li1+xV3O8

GAO Jian; JIANG Chang-Yin; WAN Chun-Rong   

  1. Material Chemistry Laboratory; Institute of Nuclear and New Energy Technology; Tsinghua University; Beijing 102201; China
  • Received:2004-03-16 Revised:2004-05-25 Published:2005-03-20 Online:2005-03-20

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摘要： 采用溶胶.凝胶和喷雾干燥相结合的方法合成了掺杂Mn和Co的球形Li1+xV3O8 材料.选取Mn和Co作为掺杂元素,并且通过实验确定掺杂的量以1％为最佳.考察了不同 热处理温度对掺杂Li1+xV3O8晶体结构与电化学性能的影响.对掺杂后的样品进行了XRD、 SEM及电化学性能测试研究.结果表明,掺杂对样品的形貌和结构没有产生影响,350℃热 处理温度下制备的掺杂Li1+xV3O8样品在常温下的循环性能有了较大的改善,其中掺Co后 的样品性能改善最为显著.

关键词: 锂离子电池, Li1+xV3O8, 掺杂, 球形

Abstract: Spherical cobalt-doped or manganese-doped Li1+xV3O8 compound was synthesized via sol-gel method and spray drying method. The best doping content of Co or Mn was one percent (molar
ratio to V). The influence of heat treatment temperature on the structure and electrochemical properties of the doped Li1+xV3O8 was studied. The investigation of XRD, SEM and the determination
of the electrochemical properties show that the doping does not influence the looks and structure, and that the product obtained by sintering at 350℃ has better cycle performance at normal
temperature. Compared with Mn, Co has better doping effect.

Key words: lithium secondary battery, Li1+xV3O8, doping, spherical

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