Fabrication of favorable interface between sulfide solid electrolyte and Li metal electrode for bulk-type solid-state Li/S battery

Formation of favorable interface between a lithium metal electrode and a solid electrolyte by inserting a lithium thin film contributes to reproducible lithium dissolution and deposition in rechargeable bulk-type all-solid-state cells. A lithium symmetrical cell with a Li2S-P2S5 solid electrolyte was galvanostatically cycled at room temperature. A bulk-type solid-state Li/S cell exhibited a good cycle performance with a capacity higher than 900 mAh g− 1 at 0.064 mA cm− 2 (0.03 C).

► Vacuum-evaporation of lithium was performed on Li2S-P2S5 solid electrolytes. ► Formation of favorable interface with lithium thin films improved reversibility of lithium dissolution and deposition. ► Bulk-type all-solid-state Li/S batteries exhibited a good cyclability with high capacity.