Research progress on interfacial problems and solid-state electrolytes in lithium batteries

All solid-state lithium ion batteries (ASSLIBs) are recognized as one of the most promising next-generation energy storage technologies due to their high energy density, excellent safety performance and high thermal stability. With the development of solid-state electrolytes (SSEs) materials, the ionic conductivity of SSEs is steadily approaching that of liquid electrolytes. In addition to the requirement of improving ionic conductivity, the primary challenge in their development is addressing the compatibility between SSEs and cathode/anode to ensure effective interfacial contact. This review summarizes the current understanding of an overview of SSEs in terms of properties and mechanisms, introduces general design strategies and specific examples of SSEs, systematically discusses the influence of SSEs/electrodes contact, elucidates the direction of development of ASSLIBs, and anticipate future investigation of the interface mechanism of ASSLIBs at high-voltage state development. We hope that this review will provide a reference to improve the compatibility problems between SSEs and electrodes, and serve as directional guidance for SSE material selection and structure design.