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

doi:10.3724/SP.J.1077.2007.01037

Abstract

Abstract: LiNi_1/3Co_1/3Mn_1/3O₂ is considered as a new-generation cathode material for lithium ion batteries. Al₂O₃ film was coated on the surface of LiNi_1/3Co_1/3Mn_1/3O₂ 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 LiNi_1/3Co_1/3Mn_1/3O₂ 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, Al₂O₃film

CLC Number:

TM911

LI Xin-Lu,KANG Fei-Yu,BAI Xin-De,SHEN Wan-Ci. Microstructure and Electrochemical Properties of LiNi_1/3Co_1/3Mn_1/3O₂ Coated with Al₂O₃ Film[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.01037.

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Microstructure and Electrochemical Properties of LiNi_1/3Co_1/3Mn_1/3O₂ Coated with Al₂O₃ Film

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