AUTHOR=Lee Jae Min , Park Young Seon , Moon Ji-Woong , Hwang Haejin 

TITLE=Ionic and Electronic Conductivities of Lithium Argyrodite Li6PS5Cl Electrolytes Prepared via Wet Milling and Post-Annealing

JOURNAL=Frontiers in Chemistry

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2021.778057

DOI=10.3389/fchem.2021.778057

ISSN=2296-2646

ABSTRACT=<p>Lithium argyrodite Li<sub>6</sub>PS<sub>5</sub>Cl powders are synthesized from Li<sub>2</sub>S, P<sub>2</sub>S<sub>5</sub>, 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 Li<sub>6</sub>PS<sub>5</sub>Cl 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 Li<sub>6</sub>PS<sub>5</sub>Cl electrolyte powder with low electronic and comparable ionic conductivities. The all-solid-state cell with the xylene-processed Li<sub>6</sub>PS<sub>5</sub>Cl electrolyte exhibits the highest discharge capacity of 192.4 mAh·g<sup>−1</sup> and a Coulombic efficiency of 81.3% for the first discharge cycle.</p>