Mo-O Dual-Doped Argyrodite Electrolyte Enables Stable All-Solid-State Lithium Batteries.

Sulfide solid electrolytes are one of the most promising solid electrolytes for all-solid-state lithium batteries due to their relatively high ionic conductivity and favorable mechanical properties. Nevertheless, their inferior moisture stability and lithium metal compatibility hinder the practical applications. Herein, a Mo-O dual-doped argyrodite LiP MoS O Cl sulfide electrolytes are synthesized to enhance both moisture stability and electrochemical characteristics. By adjusting the concentrations of dopant and annealing temperature, the optimized LiPMoSOCl sintered at 570 °C exhibits enhanced room-temperature powder cold-pressed ionic conductivity of 3.97 mS cm. Moreover, LiPMoSOCl solid electrolyte produces only one-third of HS gas with 0.58 cm g compared to pristine LiPSCl electrolyte and exhibits excellent structure stability after exposure to air. Benefitting from the generation of a stable LiOCl at the anode interface, LiPMoSOCl solid electrolyte exhibits superior interfacial compatibility and suppression capability of lithium dendrites, realizing a high critical current density of 1.51 mA cm and maintains stable lithium plating/stripping behavior for 5600 h at 0.1 mA cm and 0.1 mAh cm. In addition, the LiCoO/LiPMoSOCl/Li battery presents improved cycling stability at 1C with a capacity retention of 90.3% after 1000 cycles.