A cathode material, CuCoS/graphene@10%LiPS, is reported for all-solid-state lithium batteries with high performance. The electrical conductivity of CuCoS is improved by compounding with graphene. Meanwhile, LiPS electrolyte is coated on the surface of CuCoS/graphene nanosheets to build an intimate contact interface between the solid electrolyte and the electrode effectively, facilitating lithium-ion conduction. Benefitting from the balanced and efficient electronic and ionic conductions, all-solid-state lithium batteries using CuCoS/graphene@10%LiPS composite as cathode materials demonstrate superior cycling stability and rate capabilities, exhibiting an initial discharge specific capacity of 1102.25 mAh g at 50 mA g and reversible capacity of 556.41 mAh g at a high current density of 500 mA g after 100 cycles. These results demonstrate that the CuCoS/graphene@10%LiPS nanocomposite is a promising active material for all-solid-state lithium batteries with superior performances.
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