Evaluation of mechanical properties of Na2S–P2S5 sulfide glass electrolytes

Abstract

Mechanical properties such as formability and elastic moduli of solid electrolytes are important for the fabrication of all-solid-state batteries and retention of their charge–discharge capacities. In this paper, xNa₂S·(100 − x)P₂S₅ (mol%) sulfide glass electrolytes (x = 50, 67, and 75) were prepared and their formability and elastic moduli were evaluated by an ultrasonic pulse-echo technique and a compression test under uniaxial pressing. The glasses were better densified and showed lower Young's moduli (15–19 GPa) than the Li₂S–P₂S₅ glasses.