Reconstruction suppressed solid-electrolyte interphase by functionalized metal-organic framework

Abstract

Lithium metal batteries (LMB) hold the key to unlock the utilization of future technologies with inflating energy consumption demands. However, the long-term cycling performance of LMB under high current density and areal capacity is inferior due to the dendrite growth aggravated by the continuous unnecessary reconstruction induced by instable phases in solid-electrolyte interphase (SEI). Herein, F-functionalized metal-organic framework (MOF), i.e., UIO-66-F4, is employed to enable the enrichment of LiF and suppress the reconstruction of SEI. Moreover, the functionalized MOF can modify the solvation structure of Li+ at the interface, improving the efficiency of Li+ transfer. As a result, an ultra-stable cycling performance for more than 2000 h at 3 mA cm−2 under 6 mAh cm−2 for Li||Li symmetrical cell is achieved, properly covering the capacity range for practical application of LMB. The soft-short risk and the rapid capacity degradation in high-loading Li-S pouch cell are eliminated, benefiting its application as next-generation energy storage system.