Interfacial materials in argyrodite-based all-solid-state batteries

Particular embodiments may provide interfacial materials for a solid-state electrolyte interface. In some embodiments, the solid-state electrolyte is argyrodite-based. In some embodiments, the interfacial material may comprise a binary halide, a ternary halide, a binary sulfide, a ternary sulfide, or a combination thereof. In some embodiments, the interfacial material may be disposed at the interface of the anode and the solid-state electrolyte and/or the interface of the cathode and the solid-state electrolyte.