Metal‐Organic Framework Confined Solvent Ionic Liquid Enables Long Cycling Life Quasi‐Solid‐State Lithium Battery in Wide Temperature Range
Zhaoen Liu, Zewei Hu, Xueao Jiang, Xiwen Wang, Zhe Li, Zhengjian Chen, Yan Zhang, Shiguo Zhang
Abstract
Abstract Solid‐state Li batteries are receiving increasing attention as a prospective energy storage system due to the high energy density and improved safety. However, the high interfacial resistance between solid‐state electrolyte and electrode results in sluggish Li + transport kinetics. To tackle the interfacial problem and prolong the cycle life of solid‐state Li batteries, a quasi‐solid‐state electrolyte (QSSE) based on a solvate ionic liquid (SIL) space‐restricted in nanocages of UIO‐66 (SIL/UIO‐66) is prepared in this study. Benefiting from the effective spatial confinement of the TFSI − by the pore UIO‐66 and the strong chemical interactions between the SIL and metal atoms, SIL/UIO‐66 QSSE exhibits high ionic conductivity and good compatibility with electrodes. As a result, Li|QSSE|LFP cells demonstrate excellent rate capability and cycle stability in a wide temperature range of 25–90 °C. This study provides a realistic strategy for the fabrication of safe solid electrolytes with excellent compatibility and long cycle life for high‐performance QSSE Li‐ion batteries.