Tuning Li3PO4 modification on the electrochemical performance of nickel-rich LiNi0.6Co0.2Mn0.2O2

Zhi-kun Zhao; Hui-lin Xie; Zi-yue Wen; Ling Liu; Bo-rong Wu; Shi Chen; Dao-bin Mu; Chao-xiang Xie

doi:10.1007/s12613-020-2232-8

Volume 28 Issue 9

Sep. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(9): 1488-1496

Zhi-kun Zhao, Hui-lin Xie, Zi-yue Wen, Ling Liu, Bo-rong Wu, Shi Chen, Dao-bin Mu, and Chao-xiang Xie, Tuning Li₃PO₄ modification on the electrochemical performance of nickel-rich LiNi_0.6Co_0.2Mn_0.2O₂, Int. J. Miner. Metall. Mater., 28(2021), No. 9, pp. 1488-1496. https://doi.org/10.1007/s12613-020-2232-8

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Zhi-kun Zhao, Hui-lin Xie, Zi-yue Wen, Ling Liu, Bo-rong Wu, Shi Chen, Dao-bin Mu, and Chao-xiang Xie, Tuning Li3PO4 modification on the electrochemical performance of nickel-rich LiNi0.6Co0.2Mn0.2O2, Int. J. Miner. Metall. Mater., 28(2021), No. 9, pp. 1488-1496. https://doi.org/10.1007/s12613-020-2232-8

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Research Article

Tuning Li₃PO₄ modification on the electrochemical performance of nickel-rich LiNi_0.6Co_0.2Mn_0.2O₂

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Corresponding author:
Dao-bin Mu E-mail: mudb@bit.edu.cn
Received: 7 September 2020; Revised: 20 November 2020; Accepted: 27 November 2020; Available online: 28 November 2020

Abstract

Abstract

Surface deterioration occurs more easily in nickel-rich cathode materials with the increase of nickel content. To simultaneously prevent deterioration of active cathode materials and improve the electrochemical performance of the nickel-rich cathode material, the surface of nickel-rich LiNi_0.6Co_0.2Mn_0.2O₂ cathode material is decorated with the stable structure and conductive Li₃PO₄ by a facile method. The LiNi_0.6Co_0.2Mn_0.2O₂–1wt%, 2wt%, 3wt%Li₃PO₄ samples deliver a high-capacity retention of more than 85% after 100 cycles at 1 C under a high voltage of 4.5 V. The effect of different coating amounts (0–5wt%) for the LiNi_0.6Co_0.2Mn_0.2O₂ cathode is analyzed in detail. Results show that 2wt% coating of Li₃PO₄ gives better performance compared to other coating concentrations. Detailed analysis of the structure of the samples during the charge−discharge process is performed by in-situ X-ray diffraction. It is indicated that the modification for LiNi_0.6Co_0.2Mn_0.2O₂ cathode could protect the well-layered structure under high voltages. In consequence, the electrochemical performance of modified samples is greatly improved.
- nickel rich;
- lithium phosphate;
- coating;
- high voltage

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