Evaluation of young's modulus of Li2S-P2S5-P2O5 oxysulfide glass solid electrolytes

Mechanical properties such as elastic modulus of solid electrolytes are important for all-solid-state batteries. To investigate the effects of a partial substitution of oxide for sulfide on Young's modulus, 70Li(2)S center dot(30 - x)P2S5 center dot xP(2)O(5) (mol%) (x = 0, 3 and 10) oxysulfide glasses were prepared and characterized. Young's moduli were measured by ultrasonic pulse echo method for the dense pellets prepared by hot pressing at around glass transition temperature. The Young's moduli of 70Li(2)S center dot(30 - x)P2S5 center dot xP(2)O(5) glasses were 22-27 GPa and increased with an increase in the P2O5 content. The highest Young's modulus in this report was 27 GPa for the glass with 10 mol% P2O5. (C) 2014 The Ceramic Society of Japan. All rights reserved.