Polar interaction of polymer host-solvent enables stable solid electrolyte interphase in composite lithium metal anodes

查看全文 作　　者：Peng [1]Shi;Ze-Yu [2]Liu;Xue-Qiang [1,4]Zhang;Xiang [1]Chen;Nan [1]Yao;Jin [1]Xie;Cheng-Bin [1]Jin;Ying-Xin [3]Zhan;Gang [2]Ye;Jia-Qi [3]Huang;Stephens IfanE [5]L;Titirici Maria-[6]Magdalena;Qiang [1]Zhang

机构地区：[1]Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China;[2]Collaborative Innovation Center of Advanced Nuclear Energy Technology,Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China;[3]Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China;[4]Shanxi Research Institute for Clean Energy,Tsinghua University,Taiyuan 030032,Shanxi,China;[5]Department of Materials,Molecular Sciences Research Hub,Imperial College London,London W12 OBZ,UK;[6]epartment of Chemical Engineering,Imperial College London,South Kensington Campus,London SW72AZ,UK

出　　处：《Journal of Energy Chemistry》索引2022年第31卷第1期,共8页

基　　金：supported by the National Natural Science Foundation of China (21825501 and U1932220);the National Key Research and Development Program (2016YFA0202500);the Seed Fund of Shanxi Research Institute for Clean Energy (SXKYJF015);the Scientific and technological Key Project of Shanxi Province (20191102003);the Tsinghua University Initiative Scientific Research Program. 摘　　要：The lithium(Li) metal anode is an integral component in an emerging high-energy-density rechargeable battery.A composite Li anode with a three-dimensional(3 D) host exhibits unique advantages in suppressing Li dendrites and maintaining dimensional stability.However,the fundamental understanding and regulation of solid electrolyte interphase(SEI),which directly dictates the behavior of Li plating/stripping,are rarely researched in composite Li metal anodes.Herein,the interaction between a polar polymer host and solvent molecules was proposed as an emerging but effective strategy to enable a stable SEI and a uniform Li deposition in a working battery.Fluoroethylene carbonate molecules in electrolytes are enriched in the vicinity of a polar polyacrylonitrile(PAN) host due to a strong dipole-dipole interaction,resulting in a LiF-rich SEI on Li metal to improve the uniformity of Li deposition.A composite Li anode with a PAN host delivers 145 cycles compared with 90 cycles when a non-polar host is employed.Moreover,60 cycles are demonstrated in a 1:0 Ah pouch cell without external pressure.This work provides a fresh guidance for designing practical composite Li anodes by unraveling the vital role of the synergy between a 3 D host and solvent molecules for regulating a robust SEI. 关键词：Lithium metal Polar interaction Solid electrolyte interphase Lithium plating Composite anode

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Polar interaction of polymer host-solvent enables stable solid electrolyte interphase in composite lithium metal anodes

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