Framework revolution: metal-organic frameworks-assisted ion transport and interface design in solid-state electrolytes

초록

Solid-state electrolytes (SSEs), as vital components of solid-state batteries (SSBs), have been extensively researched to enhance the performance of next-generation SSBs. Metal-organic frameworks (MOFs) are novel matrices for framework solid electrolytes (FSEs) that provide three-dimensional channels for ion transport and interfaces compatible with electrodes owing to their ordered nanopore networks and tunable pore sizes. This review begins by comparing the intrinsic properties and ion-conduction mechanisms of various electrolytes. Subsequently, various MOF-enhanced SSEs, including conductive-MOF, MOF@ionic liquid, MOF@polymer, and MOF-assisted polymer/oxide-hybrid SSEs, are analyzed to provide an in-depth summary of the ion-migration mechanisms. The structure-property relationships across four categories of MOF-based FSEs are synthesized to highlight universal design principles for ion transport, emphasizing anion immobilization, solvation restructuring, pore-confinement dynamics, and interfacial nanowetting. By combining computational and experimental insights, the review provides practical guidelines for developing framework electrolytes that exhibit high conductivity and stability. Finally, the challenges and future research directions for MOF-based FSEs are proposed to guide the development of solid-state batteries with superior performance.

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