Oxysulfide glasses xLi2O–(1 − x)(0.6Li2S–0.4P2S5)

Amorphous solid electrolytes in the system xLi2O–(1 − x)(0.6Li2S–0.4P2S5) (with x = 0.1, 0.15, 0.2, 0.25, 0.3, 0.35 and 0.4) have been prepared from a mixture of Li2O, Li2S and P2S5 using a mechanical milling technique at room temperature and in inert atmosphere. The oxysulfide powder mechanically milled for 80 h with x = 0.25 shows an ionic conductivity (σ) of 2.5 × 10−4 S cm−1 at 300 K which is the highest in this series. The glass transition temperature (Tg) exhibits a minimum at x = 0.25. Constant volume molecular dynamics was done for all x. Structural and transport results from molecular dynamics (MD) simulation are described. Changes in structure with x and their influence on σ and Tg are discussed.