Li metal-free rechargeable all-solid-state Li2S/Si battery based on Li7P3S11 electrolyte

As high energy density and enhanced safety are required for the lithium-ion battery development, all-solid-state battery has attracted significant attention. Herein, we report an all-solid-state full battery consisting of a Li 7 P 3 S 11 solid electrolyte coated silicon anode, Li 2 S/graphene composite cathode, and Li 7 P 3 S 11 solid-state electrolyte. With a high capacity for the silicon anode and Li 2 S cathode, this battery yields a high theoretical specific energy density up to 1495 Wh kg −1 , which is higher than that of lithium-ion batteries based on oxide cathodes. Moreover, Li 2 S cathode is used as lithium source instead of using metallic lithium, avoiding interface reaction between lithium metal anode and sulfide electrolyte Li 7 P 3 S 11 . This all-solid-state battery system we proposed could avoid the safety issues associated with the use of lithium metal and be a promising candidate for an enhanced energy density, which would promote their applications in the fields of electric vehicles and portable electronics.