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 Li7P3S11 solid electrolyte coated silicon anode, Li2S/graphene composite cathode, and Li7P3S11 solid-state electrolyte. With a high capacity for the silicon anode and Li2S 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, Li2S cathode is used as lithium source instead of using metallic lithium, avoiding interface reaction between lithium metal anode and sulfide electrolyte Li7P3S11. 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.