High-entropy argyrodite lithium superionic conductors

In a recent study published in ACS Materials Letters, Lin and colleagues reported a compositionally complex superionic conductor, Li_6.5[P_0.25Si_0.25Ge_0.25Sb_0.25]S₅I, for solid-state battery applications. This (multi-cation substituted) argyrodite-based electrolyte material has a configurational entropy greater than 1.5 R and was found to exhibit high ionic conductivity at room temperature (∼13 mS/cm) and a low activation energy for lithium transport (∼0.2 eV).