Cl- and Al-Doped Argyrodite Solid Electrolyte Li6PS5Cl for All-Solid-State Lithium Batteries with Improved Ionic Conductivity

Argyrodite solid electrolytes such as lithium phosphorus sulfur chloride (Li6PS5Cl) have recently attracted great attention due to their excellent lithium-ion transport properties, which are applicable to all-solid-state lithium batteries. In this study, we report the improved ionic conductivity of an argyrodite solid electrolyte, Li6PS5Cl, in all-solid-state lithium batteries via the co-doping of chlorine (Cl) and aluminum (Al) elements. Electrochemical analysis was conducted on the doped argyrodite structure of Li6PS5Cl, which revealed that the substitution of cations and anions greatly improved the ionic conductivity of solid electrolytes. The ionic conductivity of the Cl- and Al-doped Li6PS5Cl (Li5.4Al0.1PS4.7Cl1.3) electrolyte was 7.29 x 10(-3) S cm(-1) at room temperature, which is 4.7 times higher than that of Li6PS5Cl. The Arrhenius plot of the Li5.4Al0.1PS4.7Cl1.3 electrolyte further elucidated its low activation energy at 0.09 eV.

Automated summary

This study reports the improved ionic conductivity of a solid electrolyte, Li6PS5Cl, in all-solid-state lithium batteries through the co-doping of chlorine and aluminum elements. The Cl- and Al-doped Li6PS5Cl electrolyte exhibits a significantly higher ionic conductivity (7.29 x 10(-3) S cm(-1)) at room temperature, which is 4.7 times higher than that of Li6PS5Cl. The low activation energy (0.09 eV) of the doped electrolyte further enhances its conductivity.