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Improvement of electrochemical properties of LiCoO2 at 4.6 V by a LiPAA coating

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Abstract

Structural instability and interface side reactions are considered to be the key factors that LiCoO2 (LCO) cannot maintain good electrochemical performance at voltages above 4.5 V. Here, a coating of lithium polyacrylate (LiPAA) was coated on the surface of the LCO by a wet chemical method. At a current density of 15 mA g−1, LCO coated with LiPAA coating (LCO@LiPAA) has a discharge capacity of 216.7 mAh g−1 in the voltage range of 2.7–4.6 V after 100 cycles, and the capacity retention rate is 84.53%. Even at a current density of 750 mA g−1, the LCO@LiPAA-positive electrode still has a discharge capacity of 130.3 mAh g−1. The results show that the uniform coating effectively blocks the side reactions between LCO and electrolyte, inhibits the occurrence of the irreversible phase transition of LCO, and improves the electrochemical performance of LCO@LiPAA cathode at 4.6 V.

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The data used to support the findings of this study are available from the corresponding author upon request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 52064035), the Key Research and Development Program of Gansu Province (21YF5GA078), and the Natural Science Foundation of Zhejiang Province (Grant No. LGG22E020003).

Funding

Funding were provided by National Natural Science Foundation of China (Grant No. 52064035), Key Research and Development Program of Gansu Province (Grant No. 21YF5GA078) and Natural Science Foundation of Zhejiang Province (Grant No. LGG22E020003).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

    Hongfu Gao, Yanshuang Meng, Xingzhong Liu & Fuliang Zhu

  2. State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou, 730050, China

    Yanshuang Meng & Fuliang Zhu

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  1. Hongfu Gao
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FZ and YM guided all the experimental design, and led the manuscript preparation and revision work. HG did most of the experiments, data analysis, and prepared the draft manuscript. XL conducted some experiments. All authors have given approval to the final version of the manuscript.

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Correspondence to Yanshuang Meng or Fuliang Zhu.

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Gao, H., Meng, Y., Liu, X. et al. Improvement of electrochemical properties of LiCoO2 at 4.6 V by a LiPAA coating. J Mater Sci: Mater Electron 33, 17125–17136 (2022). https://doi.org/10.1007/s10854-022-08588-w

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