Interfacial Challenges, processing strategies, and composite applications for high voltage all-solid-state lithium batteries based on halide and sulfide solid-state electrolytes

Conventional lithium−ion batteries use flammable liquid electrolytes may increase the risk of spontaneous combustion and explosion. The emergence of all−solid−state lithium batteries (ASSLBs) can not only solve the problem of battery safety, but its higher energy density can endow batteries with superior performance. In recent years, a series of solid−state electrolytes (SSEs) have been developed and designed. Among them, halide and sulfide SSEs have attracted much attention because of their excellent room temperature ionic conductivity and easy processability. However, the interface compatibility problems cannot be ignored, which limits the practical application of both SSE. Therefore, the development and design of halide and sulfide SSE with good (electrical)chemical stability is of great significance for stabilizing the interface reaction and improving the performance of ASSLB. In this review, the intrinsic electrochemical stability and corresponding influencing factors of both SSE are firstly described. Then, based on the comparative analysis of (electric)chemical stability, the interface compatibility modification strategies of halide and sulfide SSEs with Li anode and high−voltage cathode active materials are systematically reviewed. In particular, according to the different compatibility exhibited by halide or sulfide SSE with the electrodes, the feasibility of combining the two as halide/sulfide composite SSEs to improve the overall interface compatibility of ASSLBs is systematically summarized. Finally, prospects for the SSEs−electrode interface issue are presented with a view to providing guidance for future research on all−solid−state lithium batteries.