物理化学学报 >> 2011, Vol. 27 >> Issue (11): 2587-2592.doi: 10.3866/PKU.WHXB20111124

电化学和新能源 上一篇    下一篇

焙烧温度对锂离子电池正极材料Li2MnSiO4/C 电化学性能的影响

魏怡1, 王利娟1, 闫继1, 沙鸥1, 唐致远1, 马莉2   

  1. 1. 天津大学化工学院, 天津 300072;
    2. 东莞迈科科技有限公司, 广东东莞 523800
  • 收稿日期:2011-07-04 修回日期:2011-09-06 发布日期:2011-10-27
  • 通讯作者: 魏怡 E-mail:weiyi_777@163.com
  • 基金资助:

    国家自然科学基金(20973124)资助项目

Calcination Temperature Effects on the Electrochemical Performance of Li2MnSiO4/C Cathode Material for Lithium Ion Batteries

WEI Yi1, WANG Li-Juan1, YAN Ji1, SHA Ou1, TANG Zhi-Yuan1, MA Li2   

  1. 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China;
    2. McNair Technology Company, Limited, Dongguan 523800, Guangdong Province, P. R. China
  • Received:2011-07-04 Revised:2011-09-06 Published:2011-10-27
  • Contact: WEI Yi E-mail:weiyi_777@163.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20973124).

摘要: 采用液相法合成了Li2MnSiO4/C 复合正极材料, 并研究了不同焙烧温度对材料的结构、形貌和电化学性能的影响. 利用热重(TG)分析了材料前驱体的热行为, 确定了合成Li2MnSiO4/C 复合正极材料的焙烧温度范围为600-800°C. X射线衍射(XRD)测试结果表明, 不同温度下合成的样品材料均具有正交结构, 且空间群为Pmn21, 同时利用扫描电子显微镜(SEM)对所得样品材料的微观形貌及颗粒大小进行了表征. 将所得Li2MnSiO4/C 复合正极材料组装成扣式电池, 并在不同的电流密度下进行充放电测试, 结果表明: 700°C合成的样品材料电化学性能最佳, 具有较高的库仑效率及很好的循环稳定性.

关键词: 锂离子电池, 正极材料, Li2MnSiO4, 液相法, 焙烧温度

Abstract: As a new potential cathode material for lithium ion batteries, Li2MnSiO4/C was synthesized by a solution method. The thermal behavior of the precursor for Li2MnSiO4/C was measured by thermogravimetric (TG) analysis and the range of calcination temperatures from 600 to 800°C was determined. X-ray powder diffraction (XRD) patterns indicated that all the Li2MnSiO4/C samples crystallized in an orthorhombic structure with space group Pmn21. The morphology and particle size of the samples were also characterized by scanning electron microscopy (SEM). The effects of calcination temperature on the electrochemical performance of Li2MnSiO4/C were studied using galvanostatic charge-discharge measurements at various current densities. The results showed that the sample prepared at 700°C exhibited a much higher coulombic efficiency and better cyclic performance than the other samples.

Key words: Lithium ion battery, Cathode material, Li2MnSiO4, Solution method, Calcination temperature

MSC2000: 

  • O646