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

Electrochemical performances of the Li2S-P2S5 solid electrolyte (SE)-acetylene black (AB) composite electrode materials were examined in all-solid-state lithium secondary batteries. The xLi2S·(100 − x)P2S5 (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 80Li2S·20P2S5 SE-AB composite electrode exhibited the largest charge capacity of 240 mAh g− 1 (normalized by the weight of 80Li2S·20P2S5) in the xLi2S-(100 − x)P2S5 SEs. The relation between the obtained charge capacities and the electrical conductivities of the components of the composite electrodes was investigated.