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In-situ construction of hybrid artificial SEI with fluorinated siloxane to enable dendrite-free Li metal anodes

查看全文 作　　者：Lei [1,2]Wei;Zhaoqing [1,2]Jin;Jianhao [1,2]Lu;Yang [2,3]Guo;Zilong [1,2]Wang;Gaoping [1,2]Cao;Jingyi [1,2]Qiu;Anbang [1,2]Wang;Weikun [1,2]Wang 高影响力作者 机构地区：[1]State Key Laboratory of NBC Protection for Civilian,Beijing,102205,China;[2]Research Institute of Chemical Defense,Beijing,100191,China;[3]Beijing Key Laboratory of Electrochemical Process and Technology for Materials,Beijing University of Chemical Technology,Beijing,100029,China高影响力机构 出　　处：《Journal of Materiomics》索引2023年第9卷第2期,共10页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(No.21935006). 摘　　要：Lithium(Li)metal anode holds great promise for high-energy-density rechargeable batteries.However,it suffers from the Li dendrites growth and uncontrollable side reactions with electrolyte due to the unstable solid electrolyte interphase(SEI)layer.Herein,we propose a facile strategy for the in-situ fabricate of organic-inorganic composite artificial SEI layers on Li surfaces,which consist of organic fluorinated siloxane and inorganic LiF-rich phases.The hybrid artificial SEI endows high mechanical strength(13.1 GPa)and Liþtransfer number(0.62).Such robust SEI protective layers can not only guide uniform nucleation and deposition of Li metal by facilitating uniform Li-ion distribution,but also prevent unfavourable side reactions.Accordingly,the protected metallic lithium anode(PMTFPS-Li)anode enables stable Li plating/stripping performance in symmetric cells for more than 300 h at 4 mA$h/cm^(2)under a high areal capacity of 4 mA/cm^(2).Moreover,the PMTFPS-Li/S cells could maintain more than 300 stable cycles at 0.5C and the PMTFPS-Li/LFP cells present excellent cycling performance(400 cycles at 1C)and enhanced rate capability(110.4 mA$h/g at 3 C).This work will inspire the design of artificial SEI on Li anodes for advanced Li metal batteries. 关 键 词：Fluorinated siloxane Lithium metal anode Dendrite growth Artificial SEI In-situ reaction
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