Lithium Salt Combining Fluoroethylene Carbonate Initiates Methyl Methacrylate Polymerization Enabling Dendrite-Free Solid-State Lithium Metal Battery  

作　　者：Xue Ye Jianneng Liang Baorong Du Yongliang Li Xiangzhong Ren Dazhuan Wu Xiaoping Ouyang Qianling Zhang Jianhong Liu 

机构地区：[1]Institute of Process Equipment,College of Energy Engineering,Zhejiang University,Hangzhou,310000 China [2]Graphene Composite Research Center,College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen,518061 China

出　　处：《Energy & Environmental Materials》2024年第6期50-59,共10页能源与环境材料（英文）

基　　金：funded by the National Key Research and Development Program of China(no.2020YFC1909604);Shenzhen Key Projects of Technological Research(JSGG20200925145800001);Shenzhen Basic Research Project(no.JCYJ20190808145203535).

摘　　要：This work demonstrates a novel polymerization-derived polymer electrolyte consisting of methyl methacrylate,lithium bis(trifluoromethanesulfonyl)imide and fluoroethylene carbonate.The polymerization of MMA was initiated by the amino compounds following an anionic catalytic mechanism.LiTFSI plays both roles including the initiator and Li ion source in the polymer electrolyte.Normally,lithium bis(trifluoromethanesulfonyl)imide has difficulty in initiating the polymerization reaction of methyl methacrylate monomer,a very high concentration of lithium bis(trifluoromethanesulfonyl)imide is needed for initiating the polymerization.However,the fluoroethylene carbonate additive can work as a supporter to facilitate the degree of dissociation of lithium bis(trifluoromethanesulfonyl)imide and increase its initiator capacity due to the high dielectric constant.The as-prepared poly-methyl methacrylate-based polymer electrolyte has a high ionic conductivity(1.19×10^(−3)S cm^(−1)),a wide electrochemical stability window(5 V vs Li^(+)/Li),and a high Li ion transference number(t_(Li^(+)))of 0.74 at room temperature(RT).Moreover,this polymerization-derived polymer electrolyte can effectively work as an artificial protective layer on Li metal anode,which enabled the Li symmetric cell to achieve a long-term cycling performance at 0.2 mAh cm^(−2)for 2800 h.The LiFePO_(4)battery with polymerization-derived polymer electrolyte-modified Li metal anode shows a capacity retention of 91.17%after 800 cycles at 0.5 C.This work provides a facile and accessible approach to manufacturing poly-methyl methacrylate-based polymerization-derived polymer electrolyte and shows great potential as an interphase in Li metal batteries.

关 键 词：in situ polymerization lithium anode polymer electrolyte solid-state lithium batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]