Synthesis and purification of SiS2 and Li2S for Li9.54Si1.74P1.44S11.7Cl0.3 solid electrolyte in Lithium-ion batteries

Abstract There are global purchasing difficulties to obtain raw materials such as SiS2 and Li2S, while each has an extreme high price, for preparing lithium-silicon-phosphorus-sulfur (LSiPS)-type solid electrolytes in lithium-ion batteries. In this work, pure SiS2 was prepared through an elemental-synthesis gasifying-separation (ESGS) process, and pure Li2S through a carbothermal-reduction ethanol-dissolution (CRED) process. These processes proposed firstly are safe, cheap, convenient and feasible with an acceptable requirement for facilities and operations. The Li9.54Si1.74P1.44S11.7Cl0.3 was prepared and cells were assembled to evaluate electrochemical properties.