Functional ternary salt construction enabling an in-situ Li3N/LiF-enriched interface for ultra-stable all-solid-state lithium metal batteries  

作　　者：Hong-Yan Liu Xin-Yu Liu Nan Zhang Peng-Fei Wang Zong-Lin Liu Jie Shu Ting-Feng Yi 

机构地区：[1]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China [2]Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,Hebei,China [3]Faculty of Materials Science and Chemical Engineering and Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province,Ningbo University,Ningbo 315211,Zhejiang,China

出　　处：《Journal of Energy Chemistry》2025年第2期68-75,I0003,共9页能源化学(英文版)

基　　金：supported by the National Natural Science Foundation of China(nos.22309027 and 52374301);the Natural Science Foundation of Hebei Province(no.E2022501014);the Shijiazhuang Basic Research Project(nos.241790667A and 241790907A);the Fundamental Research Funds for the Central Universities(no.N2423054);the 2023 Hebei Provincial Doctoral Candidate Innovation Ability Training Funding Project(no.CXZZBS2023159);the Performance Subsidy Fund for Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province(no.22567627H).

摘　　要：Poly(ethylene oxide)-based polymer all-solid-state lithium metal batteries(ASSLBs)have received widespread attention due to their low cost,good process ability,and high energy density.Nevertheless,the growth of Li dendrites within polymer solid-state electrolytes damages the reversibility of Li anodes and still impedes their widespread application.One efficient strategy is to construct a superior solid electrolyte interface.Herein,a stable interface enriched with Li3N and LiF is in-situ formed between Li anode and a terna ry salt electrolyte.This terna ry salt electrolyte is innovatively designed by introducing lithium bis(trifluoromethane sulfonyl)imide(LiTFSI),lithium bis(fluorosulfonyl)imide(LiFSI),and LiNO_(3)to poly(ethylene oxide)matrix.Surface characterization indicates that LiNO3and LiFSI contribute to forming a Li3N-LiF-enriched interface and meanwhile LiTFSI ensures excellent conductivity.Theoretically,among various Li compound components,Li3N has high ionic conductivity,which is beneficial for reducing overpotential,while LiF has high interfacial energy which can enhance nucleation energy and suppress the formation of Li dendrites.The experimental results show that ASSLBs coupled with LiFePO4cathode display extremely excellent cycle stability approximately 2200 cycles at 2 C,with a final and corresponding discharge specific capacity of 96.7 mA h g^(-1).Additionally,a schematic illustration of the working mechanism for the Li_(3)N-LiF interface is proposed.

关 键 词：Solid electrolyte All-solid-state lithium metal batteries PEO(LiTFSI) In-situ SEI Lithium dendrite 

分 类 号：TM9[电气工程—电力电子与电力传动]