Preparation of composite electrode with Li2S–P2S5 glasses as active materials for all-solid-state lithium secondary batteries

Abstract

Abstract Electrochemical performances of the Li 2 S–P 2 S 5 solid electrolyte (SE)–acetylene black (AB) composite electrode materials were examined in all-solid-state lithium secondary batteries. The xLi 2 S·(100 − x)P 2 S 5 (x = 80, 87.5, 90, 95 and 100 mol%) SEs with the addition of AB were partially used as an active material with lithium source in all-solid-state cells. The cell using the 80Li 2 S·20P 2 S 5 SE–AB composite electrode exhibited the largest charge capacity of 240 mAh g − 1 (normalized by the weight of 80Li 2 S·20P 2 S 5 ) in the xLi 2 S–(100 − x)P 2 S 5 SEs. The relation between the obtained charge capacities and the electrical conductivities of the components of the composite electrodes was investigated.