Stabilizing Interface between Li2S–P2S5 Glass-Ceramic Electrolyte and Ether Electrolyte by Tuning Solvation Reaction

Using solid–liquid hybrid electrolytes is an effective strategy to overcome the large solid/solid interfacial resistance in all-solid-state batteries and the safety problems in liquid batteries. The properties of the solid/liquid electrolyte interphase layer (SLEI) are essential for the performance of solid–liquid hybrid electrolytes. In this work, the solvation reactions between Li2S–P2S5 glass-ceramic solid electrolytes (SEs) and ether electrolytes were studied, and their influence on the SLEI was examined. Although 1,2-dimethoxyethane (DME) reacted with the Li2S–P2S5 glass-ceramic SE to form a dense SLEI, 1,3-dioxolane (DOL) severely corroded the SE, resulting in a loose SLEI. Consequently, a stable SLEI formed with DME. Using a combination of the Li2S–P2S5 glass-ceramic SE and the DME-based liquid electrolyte (LE), stable lithium plating/stripping cycles over 1000 h and a hybrid Li–S battery that retained a specific capacity of 730 mAh g–1 after 200 cycles were demonstrated. The knowledge of the reactions between the sulfide electrolytes and the organic LEs is instructive for the design of stable sulfide–liquid hybrid electrolytes for advanced batteries.