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Abstract Lithium metal is well known to be one of the most promising anodes for all‐solid‐state batteries, due to its ultrahigh capacity (3860 mAh g −1 ) and the extremely low standard negative electrochemical potential (−3.04 V). However, direct and confined contact of lithium metal with solid‐state electrolytes is still a great obstacle for excellent battery performance, which induces poor interfacial compatibility to further lead to weak lithium ion transport and dendrite formation. In this work, a well‐lithium‐ion‐conducting protective interfacial layer in all‐solid‐state‐Li 6 PS 5 Cl‐based lithium metal batteries is in situ established on the surface of polished Li through spin‐coating technique with a mixture of polyacrylonitrile (PAN) and fluoroethylene (FEC) carbonate. Interestingly, it is found there is synergistic effect between PAN and FEC via a solution‐based route. The artificial protective layer (LiPFG) consisting of organic matrix embedded with inorganic Li 3 N and LiF on the surface of Li regulates the uniform lithium deposition and enhances interface stability and compatibility. Specifically, a high reversible discharge capacity of 125.7 mAh g −1 at 0.1C and a lifetime of over 80 cycles can be achieved for LiZrO 3 @LiCoO 2 /Li 6 PS 5 Cl/LiPFG@Li full cells. This work inspires ideas for in situ construction of well‐lithium‐ion‐conducting artificial layer by a feasible spin‐coating technique for all solid state lithium metal batteries.
Wang et al. (Wed,) studied this question.