Improvement on the Electrochemical Properties of Cathode Material LiNi1/3Co1/3Mn1/3O2 by Ti-F Co-substitution

Chem. J. Chinese Universities

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Improvement on the Electrochemical Properties of Cathode Material LiNi_1/3Co_1/3Mn_1/3O₂ by Ti-F Co-substitution

DING Yan-Huai^1,2, ZHANG Ping^1,2*, JIANG Yong^1,2, YIN Jiu-Ren^1,2, LU Qi-Bin³, GAO De-Shu³

1. College of Civil Engineering & Mechanics,
2. Institute of Fundamental Mechanics & Material Engineering,
3. College of Chemistry, Xiangtan University, Xiangtan 411105, China

Received:2007-05-22 Revised:1900-01-01 Online:2007-10-10 Published:2007-10-10
Contact: ZHANG Ping

Abstract

Abstract: Layered LiNi_1/3Co_1/3Mn_1/3O₂ as the cathode materials for lithium ion batteries was synthesized with the co-precipitated metal carbonate as the precursor. The effects of Ti-F co-substitution on the structure and electrochemical properties of LiNi_1/3Co_1/3Mn_1/3O₂ were studied by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), electrochemical impedance spectroscopy(EIS) and galvanostatic charge-discharge experiments. Ti-F co-substitution leads to the change in the content of transition metal ions with a low valence, thereby induces an expansion in lattice volume. Furthermore, the increase of charge-transfer resistances during the cycling was suppressed by Ti-F co-substitution. The initial discharge capacity of substituted sample is 165.23 mA·h/g and the capacity retention rate is 94.9% up to 20 cycles.

Key words: Cathode material, Electrochemical property, Co-substitution, Charge-transfer resistance

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DING Yan-Huai^1,2, ZHANG Ping^1,2*, JIANG Yong^1,2, YIN Jiu-Ren^1,2, LU Qi-Bin³, GAO De-Shu³. Improvement on the Electrochemical Properties of Cathode Material LiNi_1/3Co_1/3Mn_1/3O₂ by Ti-F Co-substitution[J]. Chem. J. Chinese Universities, doi: .

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Improvement on the Electrochemical Properties of Cathode Material LiNi_1/3Co_1/3Mn_1/3O₂ by Ti-F Co-substitution

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