Journal of Energy Chemistry ›› 2023, Vol. 79 ›› Issue (4): 253-262.DOI: 10.1016/j.jechem.2022.12.007

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In situ formed cross-linked polymer networks as dual-functional layers for high-stable lithium metal batteries

Lei Shia, Wanhui Wanga,*, Chunjuan Wanga, Yang Zhoua, Yuezhan Fengc, Tiekun Jiaa,e, Fang Wanga, Zhiyu Mina,d,*, Ji Hua,d,e,*, Zhigang Xueb,*   

  1. aSchool of Materials Science and Engineering, School of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471023, Henan, China;
    bKey Laboratory for Material Chemistry of Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China;
    cKey Laboratory of Advanced Materials Processing & Mold (Ministry of Education), National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, Henan, China;
    dHenan Intelligent Manufacturing Engineering Technology Research Center for Building Profile, Luoyang Institute of Science and Technology, Luoyang 471023, Henan, China;
    eHenan Province International Joint Laboratory of Materials for Solar Energy Conversion and Lithium Sodium based Battery, Luoyang Institute of Science and Technology, Luoyang 471023, Henan, China
  • Received:2022-09-02 Revised:2022-12-02 Accepted:2022-12-05 Online:2023-04-15 Published:2023-05-30
  • Contact: * E-mail addresses: whwang@lit.edu.cn (W. Wang), 200900300185@lit.edu.cn (Z. Min), jhu@lit.edu.cn (J. Hu), zgxue@mail.hust.edu.cn (Z. Xue).

Abstract: Lithium-metal anodes (LMAs) have been recognized as the ultimate anodes for next-generation batteries with high energy density, but stringent assembly-environment conditions derived from the poor moisture stability dramatically hinder the transformation of LMAs from laboratory to industry. Herein, an in situ formed cross-linked polymer layer on LMAs is designed and constructed by a facile thiol-acrylate click chemistry reaction between poly(ethylene glycol) diacrylate (PEGDA) and the crosslinker containing multi thiol groups under UV irradiation. Owing to the hydrophobic nature of the layer, the treated LMAs demon-strate remarkable humid stability for more than 3 h in ambient air (70% relative humidity). The coating humid-resistant protective layer also possesses a dual-functional characterization as solid polymer elec-trolytes by introducing lithium bis(trifluoromethanesulfonyl)imide in the system in advance. The intimate contact between the polymer layer and LMAs reduces interfacial resistance in the assembled Li/LiFePO4 or Li/LiNi0.8Co0.1Mn0.1O2 full cell effectively, and endows the cell with an outstanding cycle performance.

Key words: Lithium-metal anode, Humid-resistant protective film, Solid-state polymer electrolytes, Cross-linked polymers