Advanced Metal-Organic Frameworks for Solid-State Electrolytes of Lithium Metal Solid-State Batteries

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.