Oxygen substitution at the unbonded S site for excellent wet-air stability and lithium compatibility of Br-rich Li-argyrodite solid-state electrolytes

The Li 5.6 PS 4.45 O 0.15 Br 1.4 electrolyte prepared by the substitution of O on the S(4d) site has not only high ionic conductivity but also ultra-high lithium metal compatibility and wet-air stability.