Oxide doping improving interface performance for Li7P3S11 solid electrolytes

Controlling parasitic interface reactions and the Li dendrite growth remains challenging for all-solid-state (ASS) Li batteries, though the progress in Li-ion transport of solid electrolytes (SEs). Herein, ZnO and ZrO2 oxides are used as dopants to synthesize Li7P3S11 (LPS) glass SEs through mechanochemical synthesis. The oxide doping not only improves the ionic conductivity and air stability of LPS SEs, but more importantly also enhances the chemical stability in the interface of Li|SE as well as the Li dendrite suppression capability. Combining FIB milling with SEM-EDS detection, transversal Li dendrite deposition and growth are disclosed to occur inside the interface layer. The ASS battery using the oxide-doped LPS SE and metallic Li anode significantly outperforms that with the O-free LPS, demonstrating the merits of oxide doping toward advancing sulfide SEs.