Two-step liquid-phase synthesis of argyrodite Li₆PS₅Cl solid electrolyte using nonionic surfactant

In the present work, argyrodite Li6PS5Cl sulfide solid electrolyte is prepared by a liquid phase process, consisting of two steps: (1) suspension-reaction under the ultrasonication of Li2S, P2S5, and LiCl precursors in acetonitrile and, (2) dissolution-precipitation involving the addition of ethanol/acetonitrile and solvents removal by heating at 180 degrees C. The effect of theaddition of a nonionic surfactant on the properties of the sulfide solid electrolyte is alsostudied. The synthesis process allows to obtain Li6PS5Cl argyrodite solid electrolyte withhigh ionic conductivity of 2.0 x 10-4S cm(-1), the low activation energy of 0.22 eV, and electrochemical stability up to 5 V (vs. Li). A regular particle distribution with a size smaller than 1 mu m is obtained by the addition of the surfactant. (c) 2021 SECV. Published by Elsevier Espana, S.L.U.