Microstructure and Electrochemical Properties of LiNi1/3Co1/3Mn1/3O2 Coated with Al2O3 Film
Al2O3膜表面包覆LiNi1/3Co1/3Mn1/3O2的微观结构和电化学特性

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.