Advanced Metal–Organic Frameworks for Solid‐State Electrolytes of Lithium Metal Solid‐State Batteries

Abstract Driven by the escalating demand for higher energy density and enhanced safety, solid‐state batteries (SSBs) have received increasing research interest as a next‐generation energy storage technology. Among the various solid‐state electrolyte (SSE) candidates, metal–organic frameworks (MOFs) have emerged as a compelling class of materials owing to their well‐defined porous architectures, high surface areas, and exceptional chemical tunability. These features make MOFs a promising platform for elucidating ion transport mechanisms and designing high‐performance SSEs. Recent advances in the synthesis and functionalization of MOF‐based SSEs have shown potential for improving the efficiency of solid‐state electrochemical systems. This review provides a comprehensive overview of the classification, intrinsic advantages, and rational design strategies of MOF‐based SSEs for SSB applications. Furthermore, the fabrication techniques of MOF‐based electrolyte membranes and recent progress in MOF‐enabled SSBs are critically discussed. Key challenges and prospective research directions are also outlined, aiming to support the development of MOF‐based SSBs with improved safety and energy density.