| Title | Sustainable synthesis of SiS2 for solid-state electrolytes by cascaded metathesis |
|---|---|
| ID_Doc | 30017 |
| Authors | Smith, WH; Vaselabadi, SA; Wolden, CA |
| Title | Sustainable synthesis of SiS2 for solid-state electrolytes by cascaded metathesis |
| Year | 2023 |
| Published | |
| Abstract | Sulfide-based electrolytes containing silicon offer high ionic conductivity and are employed in emerging solid-state batteries that are promising for electric vehicles due to their improved energy density and safety. How-ever, their deployment is constrained by the high cost and low availability of the SiS2 precursor. Here we introduce a green, solution-based synthesis of SiS2 through coupled metathesis reactions. First, the key Li2S precursor is synthesized from the room-temperature reaction between abundant Na2S and LiCl in ethanol. Next, the Li2S is recovered from solution and combined with SiCl4 in ethyl acetate to form a SiS2 solution and regenerate LiCl. The synthesized Li2S and SiS2 are characterized and then combined to form a glassy solid electrolyte with a conductivity of 0.11 mS cm-1 at 30 degrees C, validating the utility of metathesis-derived metal sulfides to solid electrolyte synthesis. In this cascaded metathesis scheme the expensive components, LiCl and solvents, are recovered and recycled in a circular economy. The cascaded metathesis process can in principle be used to synthesize nearly any metal sulfide of interest to a wide range of applications including energy con-version/storage, catalysis, electronics, and optics. |
| http://manuscript.elsevier.com/S2352492823002647/pdf/S2352492823002647.pdf |
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