Halogen Doping Mechanism and Interface Strengthening in the NaSbS Electrolyte via Solid-State Synthesis.

Good-performing sodium solid electrolytes (SSEs) are essential for constructing all-solid-state sodium-ion batteries operating at ambient temperature. Sulfide solid electrolyte, NaSbS (NBS), an excellent SSE with good chemical stability in humid air, can be synthesized with low-cost processing. However, NaSbS-based electrolytes with liquid-phase synthesis exhibit conductivities below milli-Siemens per centimeter.

Designed anion and cation co-doped NaSb(WM)S (M = Cl, Br, I) sulfide electrolytes with an improved conductivity and stable interfacial qualities.

The fabrication of all electrolytes from noncombustible ceramic materials offers a superior option for providing safer and higher-capacity batteries to fulfill future energy needs. To achieve a competitive performance with combustible liquid electrolytes used in commercial Li-ion batteries, the creation of ceramic material compositions with a high electrical conductivity is necessary. Here, we report that co-doping with W and halogens results in a superconductivity of 13.