Recent advances in composite cathodes for sulfide-based all-solid-state lithium-ion batteries

All-solid-state sulfide batteries (ASSBs) have become one of the most promising next-generation battery technologies due to their high energy density and good safety. However, their electrochemical performance still falls short of expectations, particularly under high-voltage cathodes and high-mass-loading conditions. Issues such as side reactions at solid-solid interfaces within the composite cathode can lead to problems including space charge layer formation, volume expansion, and hindered electron/ion transport, thereby compromising the overall performance of ASSBs. This article provides an overview of the current research progress on modifying composite cathodes in sulfide-based ASSBs. It summarizes recent advances in material surface modification (interface engineering), electrolyte optimization (material engineering), electrode doping and modification (component engineering), and electrode structural engineering, highlighting their respective advantages and applications. Furthermore, it offers guidance for future research directions in the development of composite cathodes for sulfide-based all-solid-state lithium batteries.