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Publishing Language: Chinese

Modification of LiNi0.6Co0.2Mn0.2O2 Cathode Materials via Boron Element-Doping for Lithium-ion Batteries

Fangkun LI, Zhengbo LIU, Xijun XU, Jun LIU()
School of Materials Science and Engineering, South China University of Technology, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, Guangzhou 510006, China
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Abstract

Boron (B)-doped LiNi0.6Co0.2Mn0.2O2 cathode materials were prepared by oxalate co-precipitation and subsequent heat treatment. The effects of doping with different boron sources (B2O3, H3BO3 and LiBO2) on the morphology, structure and electrochemical properties of the materials were investigated. The X-ray diffracation and Rietveld refinement revealed that the B element was successfully doped into the material lattice. The electrochemical performance characterization showed that the doping effect of B2O3 was the best, with excellent rate performance (the specific discharge capacity was 145.1 mA·h/g at 5 C) and long-term cycle stability (the capacity retention ratio was 84.5% after 300 cycles at 1 C). The enhanced electrochemical performance is attributed to the fact that boron doping effectively reduces the surface residual lithium compound, enhances the structural stability of the material, effectively inhibits the voltage drop and improve the polarization phenomenon, and reduces the charge transfer resistance, thus inhibiting the capacity decay and achieving excellent electrochemical performance.

Keywords

lithium-ion batteriesnickel-rich cathode materialsstructure controlboron element-dopingvoltage drop
CLC number: TM912 Document code: A Article ID: 0454-5648(2022)01-0037-10

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Journal of the Chinese Ceramic Society
Volume 50 Issue 1,
January 2022
Pages 37-46
DOI: 10.14062/j.issn.0454-5648.20210513
Cite this article:
LI F, LIU Z, XU X, et al. Modification of LiNi0.6Co0.2Mn0.2O2 Cathode Materials via Boron Element-Doping for Lithium-ion Batteries. Journal of the Chinese Ceramic Society, 2022, 50(1): 37-46. https://doi.org/10.14062/j.issn.0454-5648.20210513
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