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

Abstract

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 Li 2 S−P 2 S 5 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 Li 2 S− P 2 S 5 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 Li 2 S−P 2 S 5 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.

Hybrid solid electrolyte-liquid electrolyte systems for (almost) solid-state batteries: Why, how, and where to?

“…Fan et al 113 tested the susceptibility of thiophosphate SEs to react with an ether-based LE. Two types of electrolytes, b-Li 3 PS 4 and Li 7 P 3 S 11 (Li 2 S : P 2 S 5 glass-ceramic), were exposed for 48 h to a commercially available LE, namely 1 M LiTFSI in DOL/DME (1 : 1 vol%) with 1% LiNO 3 .…”