Upgrading traditional liquid electrolyte via in situ gelation for future lithium metal batteries

High-energy lithium metal batteries (LMBs) are expected to play important roles in the next-generation energy storage systems. However, the uncontrolled Li dendrite growth in liquid electrolytes still impedes LMBs from authentic commercialization. Upgrading the traditional electrolyte system from liquid to solid and quasi-solidhas therefore become a key issue for prospective LMBs. From this premise, it is particularly urgent to exploit facile strategies to accomplish this goal. We report that commercialized liquid electrolyte can be easily converted into a novel quasi-solidgel polymer electrolyte (GPE) via a simple and efficient in situ gelation strategy, which, in essence, is to use LiPF 6 to induce the cationic polymerizationof the ether-based 1,3- dioxolaneand 1,2- dimethoxyethaneliquid electrolyte under ambient temperature. The newly developed GPE exhibits elevated protective effects on Li anodes and has universality for diversified cathodes including but not restricted to sulfur, olivine-type LiFePO 4 , and layered LiNi 0.6 Co 0.2 Mn 0.2 O 2 , revealing tremendous potential in promoting the large-scale application of future LMBs.