Solid-state lithium metal batteries are promising next-generation batteries for both micro-scale inte-grated electronic devices and macro-scale electric vehicles.However,electrochemical incompatibility between electrolyte and electrodes causes continuous performance degradation.Here,we report a unique design of a double-layer composite solid-state electrolyte(D-CSE),where each layer,composed of both polymer and ceramics,is electrochemically compatible with its contacting electrode(Li anode or LiCoO2 cathode).The D-CSE has a small thickness(50 pm),high thermal stability(up to 160℃without noticeable deformation),and good flexibility even at a high ceramics content(66.7 wt％).Large-area self-standing film can be obtained by a facile coating route.The electrolyte/electrode interface can be further enhanced via forming a soft interface by in-situ polymerization.Quasi-solid-state Li|D-CSE|LiCoO2 coin cells with the cathode-supported D-CSE can deliver a high initial discharge capacity of 134 mAh g-1 and a high capacity retention of 83％after 200 cycles at 0.5 C and 60℃.Quasi-solid-state Li|D-CSE|LiCoO2 pouch cells(designed capacity 8.6 mAh)with the self-standing D-CSE have a high retention of 80％after 180 cycles at 2 mA charge and 4 mA discharge.At a high cathode loading(19.1 mg cm-2),the Li|D-CSE|LiCoO2 pouch cell still can be stably cycled,and can withstand abuse tests of folding,cutting and nail penetration,indicating practical applications of the D-CSE.

Xiao Chen;Qiushi Sun;Jian Xie;Cheng Huang;Xiongwen Xu;Jian Tu;Xinbing Zhao;Tiejun Zhu

State Key Laboratory of Silicon Materials,School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China;LI-FUN Technology Corporation Limited,Zhuzhou 412000,Hunan,China

能源化学

[1]Xiao Chen;Qiushi Sun;Jian Xie;Cheng Huang;Xiongwen Xu;Jian Tu;Xinbing Zhao;Tiejun Zhu-.Double-layer solid-state electrolyte enables compatible interfaces for high-performance lithium metal batteries)[J].能源化学,2022(11):91-99

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