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Research Article

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

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  • Received: 7 September 2020Revised: 20 November 2020Accepted: 27 November 2020Available online: 28 November 2020
  • The surface deterioration occurs more and more easily in nickel-rich cathode material with the increase of nickel content. In order to prevent deterioration of active cathode materials and improve the electrochemical performance of nickel-rich cathode material simultaneously, the surface of nickel-rich LiNi0.6Co0.2Mn0.2O2 cathode material is decorated with stable structure and conductive Li3PO4 by a facile method. The LiNi0.6Co0.2Mn0.2O2-1%wt.%, 2%wt.%, 3%wt.% Li3PO4 samples deliver high capacity retention of more than 85% after 100 cycles at 1C under high voltage of 4.5 V. The effect of different coating amount (0-5%wt.%) for LiNi0.6Co0.2Mn0.2O2 cathode is analyzed detailed and the better amount was 2wt.%. Detailed analysis of structure of the samples during the charge-discharge process is performed by in situ X-ray diffraction. It is indicated that the modification for LiNi0.6Co0.2Mn0.2O2 cathode could protect the well layered structure under the high voltages. In consequence, the electrochemical performance of modified samples is improved a lot.
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    [12] Kai-lin Cheng, Dao-bin Mu, Bo-rong Wu, Lei Wang, Ying Jiang, and  Rui Wang, Electrochemical performance of a nickel-rich LiNi0.6Co0.2Mn0.2O2 cathode material for lithium-ion batteries under different cut-off voltages, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-017-1413-6
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Tuning Li3PO4 modification on the electrochemical performance of nickel rich LiNi0.6Co0.2Mn0.2O2

  • Corresponding author:

    Dao-bin Mu    E-mail: mudb@bit.edu.cn

  • 1. School of Materials Science and Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing, 100081, China
  • 2. Sinoma Synthetic Crystals Co., Ltd, Beijing, 100018, China
  • 3. Department Shanghai Institute of Space Power-Sources, Shanghai, 200245, China

Abstract: The surface deterioration occurs more and more easily in nickel-rich cathode material with the increase of nickel content. In order to prevent deterioration of active cathode materials and improve the electrochemical performance of nickel-rich cathode material simultaneously, the surface of nickel-rich LiNi0.6Co0.2Mn0.2O2 cathode material is decorated with stable structure and conductive Li3PO4 by a facile method. The LiNi0.6Co0.2Mn0.2O2-1%wt.%, 2%wt.%, 3%wt.% Li3PO4 samples deliver high capacity retention of more than 85% after 100 cycles at 1C under high voltage of 4.5 V. The effect of different coating amount (0-5%wt.%) for LiNi0.6Co0.2Mn0.2O2 cathode is analyzed detailed and the better amount was 2wt.%. Detailed analysis of structure of the samples during the charge-discharge process is performed by in situ X-ray diffraction. It is indicated that the modification for LiNi0.6Co0.2Mn0.2O2 cathode could protect the well layered structure under the high voltages. In consequence, the electrochemical performance of modified samples is improved a lot.

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