High-temperature performance of all-solid-state battery assembled with 95(0.7Li2S-0.3P2S5)-5Li3PO4 glass electrolyte

Abstract

Sulfide glasses with a high lithium-ion conductivity are promising solid electrolyte for all-solid-state lithium-ion batteries. In this study, 95(0.7Li2S–0.3P2S5)–5Li3PO4 glass electrolyte is prepared by mixing 70Li2S-30P2S5 (mol%) glass and Li3PO4 crystal using mechanical milling technique. The effects on the structures and electrochemical properties of the obtained ternary sulfide glass were examined. The ternary sulfide glass shows a good electrochemical stability, which may exhibit a wide electrochemical window up to 10V (vs. Li/Li+). Furthermore, the 95(0.7Li2S-0.3P2S5)-5Li3PO4 glass electrolyte displays an electrical conductivity of 2.513×10−3Scm−1 at 100°C. The all-solid-state lithium-ion cell assembled with 95(0.7Li2S-0.3P2S5)-5Li3PO4 glass electrolyte shows a favourable cyclability, which can reveal a discharge capacity of 144mAhg−1 at 0.05°C and a discharge capacity of 63.9mAhg−1 at 0.1C after the 50th cycle at 100°C, respectively.