Synthesis of High Purity Lithium Sulfide for Sulfide Solid Electrolyte Applications through Hydrogen Reduction of Lithium Sulfate
This paper is aimed to present a clean,inexpensive and sustainable method to synthesize high purity lithium sulfide(Li2S)powder through hydrogen reduction of lithium sulfate(Li2SO4).A three-step reduction process has been successfully developed to synthesize well-crystallized and single-phase Li2S powder by investigating the melting,sintering and reduction behavior of the mixtures of Li2SO4-Li2S.High purity alumina was found to be the most suitable crucible material for producing high purity Li2S,because it was not attacked by the Li2SO4-Li2S melt during heating,as compared with other materials,such as carbon,mullite,quartz,boron nitride and stainless steel.The use of synthesized Li2S resulted in higher purity and substantially higher room temperature ionic conductivity(2.77 mS·cm-1)for the argyrodite sulfide electrolyte Li6PS5Cl than commercial Li2S(1.12 mS·cm-1).This novel method offers a great opportunity to produce battery grade Li2S for sulfide solid electrolyte applications.
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