无机材料学报

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Al2O3膜表面包覆LiNi1/3Co1/3Mn1/3O2的微观结构和电化学特性

李新禄, 康飞宇, 白新德, 沈万慈   

  1. 清华大学 材料系, 北京 100084
  • 收稿日期:2006-10-27 修回日期:2006-12-01 出版日期:2007-11-20 网络出版日期:2007-11-20

Microstructure and Electrochemical Properties of LiNi1/3Co1/3Mn1/3O2 Coated with Al2O3 Film

LI Xin-Lu, KANG Fei-Yu, BAI Xin-De, SHEN Wan-Ci   

  1. Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
  • Received:2006-10-27 Revised:2006-12-01 Published:2007-11-20 Online:2007-11-20

摘要: 采用液相浸渍法在球形颗粒LiNi1/3Co1/3Mn1/3O2的表面包覆上了一层Al2O3膜. 结构分析表明, 表面Al2O3膜的厚度约100nm, 具有一定的无定形结构, 核体材料具有纯六方相结构. 实验结果证明, 表面Al2O3膜能够有效提高正极材料的耐过充能力和循环稳定性. 在截止电压为3.0~4.5V, 充放电倍率为1C的条件下, Al2O 3表面包覆膜后正极活性物质50次循环的容量保持率提高了11.5%.

关键词: 正极材料, 表面包覆, 锂离子电池, Al2O3

Abstract: LiNi1/3Co1/3Mn1/3O2 is considered as a new-generation cathode material for lithium ion batteries. Al2O3 film was coated on the surface of LiNi1/3Co1/3Mn1/3O2 in order to prevent irreversible reactions between cathode and electrolytes. The structure analysis indicates that the Al2O3 film is amorphous with thickness of about 100nm, the core material has a hexagonal structure. The experiment results show that Al2O3 coating is effective to improve overcharge capability and cycle stability. The capacity retention of the coated LiNi1/3Co1/3Mn1/3O2 is increased by 11.5% compared with that of a blank sample after 50 charge-discharge cycles at the cutoff voltage of 3.0--4.5V and 1C rate.

Key words: cathode materials, surface coating, lithium ion batteries, Al2O3 film

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