An entanglement association polymer electrolyte for Li-metal batteries

Hangchao Wang, Yali Yang, Chuan Gao, Tao Chen, Jin Song, Yuxuan Zuo, Qiu Fang, Tonghuan Yang, Wukun Xiao, Kun Zhang, Xuefeng Wang () and Dingguo Xia ()
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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
Dingguo Xia: Peking University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-46883-8

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