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An entanglement association polymer electrolyte for Li-metal batteries

Author

Listed:
  • Hangchao Wang

    (Peking University)

  • Yali Yang

    (Peking University)

  • Chuan Gao

    (Peking University)

  • Tao Chen

    (Peking University)

  • Jin Song

    (Peking University)

  • Yuxuan Zuo

    (Peking University)

  • Qiu Fang

    (Peking University)

  • Tonghuan Yang

    (Peking University)

  • Wukun Xiao

    (Peking University)

  • Kun Zhang

    (Peking University)

  • Xuefeng Wang

    (Peking University
    Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Dingguo Xia

    (Peking University
    Peking University)

Abstract

To improve the interface stability between Li-rich Mn-based oxide cathodes and electrolytes, it is necessary to develop new polymer electrolytes. Here, we report an entanglement association polymer electrolyte (PVFH-PVCA) based on a poly (vinylidene fluoride-co-hexafluoropropylene) (PVFH) matrix and a copolymer stabilizer (PVCA) prepared from acrylonitrile, maleic anhydride, and vinylene carbonate. The entangled structure of the PVFH-PVCA electrolyte imparts excellent mechanical properties and eliminates the stress arising from dendrite growth during cycling and forms a stable interface layer, enabling Li//Li symmetric cells to cycle steadily for more than 4500 h at 8 mA cm−2. The PVCA acts as a stabilizer to promote the formation of an electrochemically robust cathode–electrolyte interphase. It delivers a high specific capacity and excellent cycling stability with 84.7% capacity retention after 400 cycles. Li1.2Mn0.56Ni0.16Co0.08O2/PVFH-PVCA/Li full cell achieved 125 cycles at 1 C (4.8 V cut-off) with a stable discharge capacity of ~2.5 mAh cm−2.

Suggested Citation

  • Hangchao Wang & Yali Yang & Chuan Gao & Tao Chen & Jin Song & Yuxuan Zuo & Qiu Fang & Tonghuan Yang & Wukun Xiao & Kun Zhang & Xuefeng Wang & Dingguo Xia, 2024. "An entanglement association polymer electrolyte for Li-metal batteries," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46883-8
    DOI: 10.1038/s41467-024-46883-8
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    References listed on IDEAS

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