Zeolitic imidazolate framework enables practical room-temperature operation of solid-state lithium batteries

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 degrees 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 degrees C (0.44 mA cm(-2)) at room temperature. This work provides an efficient and promising strategy of fabri-cating competitive SPEs for solid-state lithium-based batteries. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

By introducing zeolitic imidazolate framework-90 (ZIF-90) as a filler into solid-state polymer electrolytes (SPEs), the ionic conductivity of SPEs was significantly enhanced. The SPE modified with ZIF-90 exhibited outstanding ionic conductivity and low activation energy at 30 degrees C, along with a high specific discharge capacity in experiments.