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Citation: Xinlong WANG, Zhenguo CHENG, Guo WANG, Xiaokuen ZHANG, Yong XIANG, Xinquan WANG. Enhancement of the fragile interface of high voltage LiCoO2 by surface gradient permeation of trace amounts of Mg/F[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(3): 571-580. doi: 10.11862/CJIC.20230259 shu

Enhancement of the fragile interface of high voltage LiCoO2 by surface gradient permeation of trace amounts of Mg/F

  • School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China

  • Corresponding author: Xinquan WANG, wangxinquan@uestc.edu.cn
  • Received Date: 10 July 2023
    Revised Date: 9 January 2024

Figures(6)

  • Low-concentration gradient-modified samples of LiCoO2 were prepared by sintering at 1 050℃ using high-temperature solid-phase method, and were coated with LiF doping (LCOLF, LCO@LF) and MgF2 doping (LCOMF, LCO@MF). The material morphologies and electrochemical properties were compared and analyzed utilizing characterization tests such as X-ray photoelectron spectroscopy, transmission electron microscopy, and electrochemical techniques. The results show that in bulk-doping composite electrodes, the thermogravimetric test demonstrated that LCOLF had optimal thermal stability. In LCOMF crystals, crystal plane spacing of (003) and (104) contracted; after 70 cycles at 1C rate under 45℃, the specific capacities of LCOLF and LCOMF were 141.45 and 166.98 mAh·g-1 respectively, and their cycling performance was superior to that of the LiCoO2. In the surface-coated composite electrodes, LCO@LF and LCO@MF grains had clean surfaces and the bond valence of lattice oxygen was enhanced toward higher binding energy; LCO@MF built a solid and compact coating layer, and the specific capacity and capacity retention after 70 cycles were 183 mAh·g-1 and 91.26% (that of LCO@LF were respectively 154.38 mAh·g-1 and 77.54%). The cycling performance of surface-coated composite electrodes was significantly better than that of bulk-doping composite electrodes.
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