Interface stability of cathode for all-solid-state lithium batteries based on sulfide electrolyte: Current insights and future directions

All-solid-state lithium batteries (ASSLBs) are considered one of the most promising candidates for future energy storage devices. Among them, sulfide-based solid electrolytes (SSEs) have garnered extensive research attention due to their outstanding thermal stability, high ionic conductivity, low Young's modulus, and wide electrochemical window. In order to improve the rate performance, cycle stability and capacity of ASSLBs, people usually use SSEs, conductive carbon, together with active materials (AMs) to construct composite cathodes. Despite some notable progress in research related to composite cathodes, interface issues have consistently posed obstacles to their industrialization and commercialization. This article comprehensively summarizes the influence of the structure, morphology, composition, and preparation process of composite cathodes on interface issues, with special emphasis on modification strategies to solve the interface problems. This article points out several promising research directions that may solve the interface issues and offer some insights and guidance to researchers in the related fields.