2D Metal-Organic Frameworks for High-Performance Solid-State Electrolytes: A Comprehensive Review.

Solid-state electrolytes (SSEs) represent a pivotal pathway for resolving critical battery safety concerns, offering excellent lithium-ion conductivity, superior chemical compatibility, wide electrochemical stability windows, robust thermal stability, and potential for low-cost mass production. However, conventional 3D metal-organic framework (3D MOF)-based SSEs are often plagued by tortuous ion conduction pathways, poor interfacial contact, and inadequate mechanical properties. In contrast, 2D metal-organic frameworks (2D MOFs) demonstrate immense potential in the SSE field, owing to their unique layered structures, abundant active sites, and tunable ion-transport channels. This article systematically reviews the latest research progress in 2D MOF-based SSEs, with a focus on their structural characteristics, ion transport mechanisms, and interface optimization strategies. We analyze current challenges and offer perspectives on future development directions, providing new insights for the design of high-performance solid-state battery electrolytes.