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 (3D) host exhibits unique advantages in sup-pressing 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 elec-trolytes 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 3D host and solvent molecules for regulating a robust SEI.

Peng Shi;Ze-Yu Liu;Xue-Qiang Zhang;Xiang Chen;Nan Yao;Jin xie;Cheng-Bin Jin;Ying-Xin Zhan;Gang Ye;Jia-Qi Huang;Stephens Ifan E L;Titirici Maria-Magdalena;Qiang Zhang

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China;Collaborative Innovation Center of Advanced Nuclear Energy Technology,Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China;Shanxi Research Institute for Clean Energy,Tsinghua University,Taiyuan 030032,Shanxi,China;Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China;Department of Materials,Molecular Sciences Research Hub,Imperial College London,London W120BZ,UK;Department of Chemical Engineering,Imperial College London,South Kensington Campus,London SW72AZ,UK

能源化学

[1]Peng Shi;Ze-Yu Liu;Xue-Qiang Zhang;Xiang Chen;Nan Yao;Jin xie;Cheng-Bin Jin;Ying-Xin Zhan;Gang Ye;Jia-Qi Huang;Stephens Ifan E L;Titirici Maria-Magdalena;Qiang Zhang-.Polar interaction of polymer host-solvent enables stable solid electrolyte interphase in composite lithium metal anodes)[J].能源化学,2022(01):172-178

Fluoroethylene

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