Ionic and Electronic Conductivities of Lithium Argyrodite LiPSCl Electrolytes Prepared via Wet Milling and Post-Annealing.

Lithium argyrodite LiPSCl powders are synthesized from LiS, PS, and LiCl via wet milling and post-annealing at 500°C for 4 h. Organic solvents such as hexane, heptane, toluene, and xylene are used during the wet milling process. The phase evolution, powder morphology, and electrochemical properties of the wet-milled LiPSCl powders and electrolytes are studied. Compared to dry milling, the processing time is significantly reduced via wet milling. The nature of the solvent does not affect the ionic conductivity significantly; however, the electronic conductivity changes noticeably. The study indicates that xylene and toluene can be used for the wet milling to synthesize LiPSCl electrolyte powder with low electronic and comparable ionic conductivities. The all-solid-state cell with the xylene-processed LiPSCl electrolyte exhibits the highest discharge capacity of 192.4 mAh·g and a Coulombic efficiency of 81.3% for the first discharge cycle.