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Zeolitic imidazolate framework enables practical room-temperature operation of solid-state lithium batteries
Materials Today Physics  (IF9.298),  Pub Date : 2021-10-16, DOI: 10.1016/j.mtphys.2021.100554
Yifang Liang, Liwei Dong, Shijie Zhong, Botao Yuan, Yunfa Dong, Yuanpeng Liu, Chunhui Yang, Dongyan Tang, Jiecai Han, Weidong He

The decent flexibility and processability of solid-state polymer electrolytes (SPEs) endow them with broad development prospects in the solid-state lithium-based batteries field. Nevertheless, the poor room-temperature ionic conductivity of SPEs severely hinders their practical applications. Herein, we design a functionalized poly (vinylidene fluoride) (PVDF)-based electrolyte, and an ionic conductivity elevation is achieved by directly introducing zeolitic imidazolate framework-90 (ZIF-90) as filler into SPE. The metal ion sites of ZIF-90 can adsorb TFSI with a large adsorption energy of −1.35 eV to facilitate the dissociation of LiTFSI. The SPE modified with ZIF-90 delivers the prominent ionic conductivity of 0.62 mS cm−1 at 30 °C and the low activation energy of 0.20 eV. Simultaneously, cells fabricated with LiFePO4 cathode exhibit the high specific discharge capacity of 118 mAh g−1 after 300 cycles at 1 C (0.44 mA cm−2) at room temperature. This work provides an efficient and promising strategy of fabricating competitive SPEs for solid-state lithium-based batteries.