高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

锂离子电池正极材料LiNi0.4Co0.2Mn0.4O2的合成、表征及电化学性能

李劼; 郑建明; 郭晓健; 龚正良; 杨勇   

  1. 厦门大学化学系, 固体表面物理化学国家重点实验室, 厦门 361005
  • 收稿日期:2005-07-05 修回日期:1900-01-01 出版日期:2006-07-10 发布日期:2006-07-10
  • 通讯作者: 杨勇

Preparation, Characterization and Electrochemical Performance of
LiNi0.4Co0.2Mn0.4O2 as Cathode Materials in Lithium Ion Battery

LI Jie; ZHENG Jian-Ming; GUO Xiao-Jian; GONG Zheng-Liang; YANG Yong*   

  1. State Key laboratory for Physical Chemistry of Solid Surfaces, Department of
    Chemistry, Xiamen University, Xiamen 361005, China
  • Received:2005-07-05 Revised:1900-01-01 Online:2006-07-10 Published:2006-07-10
  • Contact: YANG Yong

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摘要： 以过渡金属乙酸盐和氢氧化锂为原料, 应用共沉淀或流变相预处理高温烧结法优化并制备出LiNi0.4Co0.2Mn0.4O2正极材料. X射线衍射技术(XRD)及Rietveld结构精修、扫描电子显微技术(SEM)、综合热分析(TG-DSC)表征结果和电化学测试结果表明, 该材料具有单一层状结构, 颗粒大小均匀, 热稳定性好, 首次放电比容量高达208.7 mA·h/g(2.0-4.6V, 0.1 C), 电化学性能优异. 非原位(ex situ)XRD测定结果表明, 材料充至高电位下发生的不可逆相变造成了材料的循环容量衰减.

关键词: LiNi0.4Co0.2Mn0.4O2, 热稳定性, 循环容量衰减

Abstract: Cathode material of LiNi0.4Co0.2Mn0.4O2 was prepared by mixed hydroxide or rheological reaction method at 850 ℃ within 15 h. The materials were characterized by XRD with Rietveld refinement, SEM, TGDSC and electrochemical tests. The results showed that it has R-3m layered structure, with a high capacity and good thermal property. It delivered a specific capacity as high as 208.7 mA·h/g(2.0—4.6 V, 0.1 C). Phase change of LixNi0.4Co0.2Mn0.4O2(0<x<1) in charge-discharge process will affect the cyclic stability of the materials, especially in the first 10 circles.

Key words: LiNi0.4Co0.2Mn0.4O2, Thermal stability, Capacity fading

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