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％.
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.
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