摘要
Halide solid state electrolytes(SSEs)have attracted significant attention due to their outstanding advantages of better cathodic stability and higher ionic conductivity.However,the most halide SSEs are unstable against lithium,preventing their direct use with lithium anodes and thus sacrificing the energy density of all solid-state lithium batteries(AsSLBs),which significantly limits their application.Conventional strategies,such as employing Li-In anode or sulfide interface layer,suffer from reduced energy density or interfacial incompatibility.Employing a halide of the same family as the interface layer,instead of the chemically dissimilar sulfide SSEs,is expected to resolve the interfacial compatibility problem.Herein,we propose an all-halide double composite electrolyte(LTLC-LZC),where Li_(2)ZrCl_(6)(LZC)serves as the bulk layer and Li_(0.388)Ta_(0.238)La_(0.475)Cl_(3)(LTLC)functions as the anode-side interfacial contact layer.The two halide electrolytes exhibit excellent chemical compatibility and comparable processability,enabling facile cold-pressed bilayer assembly.Compared with single-layer LZC,the LTLC-LZC electrolyte significantly enhances interfacial stability and ionic conductivity.Therefore,Li|LTLC-LZC|Li symmetric cells cycle stably for over 2500 h,while Li|LTLC-LZC|NCM622 full cells deliver high initial coulombic efficiency and maintain~100%coulombic efficiency during cycling.This work provides a viable pathway toward practical high-energy halide-based AsSLBs.
基金
National Key Research and Development Program of China(2023YFB2503900)
National Natural Science Foundation of China(22505091)
Hubei Science and Technology Program(ZYYD202400156,JSCX202500431)
China Postdoctoral Science Foundation(2024M761176)
Postdoctoral Fellowship Program of CPSF(GZC20250099)
Postdoctor Project of Hubei Province(2024HBBHJD056)。
