Design Strategies, Characterization Mechanisms, and Applications of MOFs in Polymer Composite Electrolytes for Solid-State Lithium Metal Batteries

Abstract

Solid composite electrolytes (SCEs) composed of functional fillers and solid polymer electrolytes (SPEs) can overcome some shortcomings of single-phase and combine some advantages of each component, and are considered as high-performance solid-state electrolytes (SSEs) candidates for assembling solid-state lithium metal batteries (SSLMBs) with high safety and high energy density. In recent years, due to high designability of metal–organic frameworks (MOFs), MOFs/polymer composite electrolytes (MPCEs) have become a highly promising novel type of SCEs. Based on the above content, this article first describes the composition and mechanism of action of MPCEs, followed by a discussion on typical fabrication methods for MPCEs. In addition, the mechanisms of unmodified neat MOFs in improving performance for SSEs and enhancing interface stability are presented in detail, with a focus on the design strategies of MOFs and their applications in MPCEs, including dimensional design, ligand design, IL@MOFs design, and hybrid design. Finally, a thorough analysis is conducted on the current challenges faced by MPCEs, and corresponding future development directions are proposed. This review presents a comprehensive, systematic, and easily understandable analysis of the application and mechanism of action of different MOFs designs in MPCEs, providing a new perspective for researchers to study high-performance SSEs.