Liu Zhaoen, Hu Zewei, Jiang Xueao, Wang Xiwen, Li Zhe, Chen Zhengjian, Zhang Yan, Zhang Shiguo
College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy, Hunan University, Changsha, Hunan, 410082, China.
China Science Lab, General Motors Global Research & Development, Shanghai, 201206, P. R. China.
Small. 2022 Sep;18(37):e2203011. doi: 10.1002/smll.202203011. Epub 2022 Aug 15.
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.
固态锂电池因其高能量密度和更高的安全性，作为一种潜在的储能系统正受到越来越多的关注。然而，固态电解质与电极之间的高界面电阻导致锂传输动力学迟缓。为了解决界面问题并延长固态锂电池的循环寿命，本研究制备了一种基于溶剂化离子液体（SIL）且受限在UIO - 66纳米笼中的准固态电解质（QSSE）（SIL/UIO - 66）。得益于UIO - 66孔对TFSI的有效空间限制以及SIL与金属原子之间的强化学相互作用，SIL/UIO - 66 QSSE表现出高离子电导率以及与电极良好的兼容性。因此，Li|QSSE|LFP电池在25 - 90°C的宽温度范围内展现出优异的倍率性能和循环稳定性。本研究为制造具有优异兼容性和长循环寿命的安全固体电解质以用于高性能QSSE锂离子电池提供了一种切实可行的策略。
