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Enhanced rate capability and cycling stability of lithium-rich cathode material Li1.2Ni0.2Mn0.6O2 via H3PO4 pretreating and accompanying Li3PO4 coating

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Abstract

H3PO4 pretreated and Li3PO4 coated Li-rich materials Li1.2Ni0.2Mn0.6O2 have been prepared via hydrothermal followed by a facile modified method. The pretreated process partially extracts Li and O from lattice, results in pre-activation of Li2MnO3 component and the formation of spinel phase. A stable Li3PO4 coating is formed on the surface of the material during the subsequent heat treatment. H3PO4 pretreatment and Li3PO4 coating are skillfully combined using a simple method. Electrochemical studies exhibit that the electrochemical performance of Li1.2Ni0.2Mn0.6O2 is obviously improved after surface modification. The surface treated material with 0.04 mol L−1 H3PO4 shows more excellent electrochemical properties than those of Li1.2Ni0.2Mn0.6O2 cathode, with a high specific discharge capacity of 262.6 mAh g−1 at 0.1 C, a great capacity retention of 92.2% at 1 C after 100 cycles, and an outstanding rate capability reaching 105.4 mAh g−1 at 10 C. The enhanced performance is caused by the formation of spinel phase and Li3PO4 coating layer, which can accelerate the migration of Li+ and facilitate the charge transfer reaction. The Li3PO4 coating also inhibits the dissolution of transition metal ions and enhances the stability of electrode/electrolyte interface.

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Acknowledgements

Financial supports from the National Science Foundation of China, Granted No. 51371198 and Technology Project of Changsha, Granted No. K1202039-11 are gratefully acknowledged.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, Hunan, 4100083, China

    Zhaohui Yang, Hongming Zhou, Zhiqiang Bao, Jian Li & Chengjie Yin

  2. Hunan Zhengyuan Institute for Energy Storage Materials and Devices, Changsha, Hunan, 410083, China

    Hongming Zhou & Jian Li

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  1. Zhaohui Yang
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Yang, Z., Zhou, H., Bao, Z. et al. Enhanced rate capability and cycling stability of lithium-rich cathode material Li1.2Ni0.2Mn0.6O2 via H3PO4 pretreating and accompanying Li3PO4 coating. J Mater Sci: Mater Electron 30, 19493–19504 (2019). https://doi.org/10.1007/s10854-019-02315-8

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