Publication date: 10th April 2024
A key material for realizing all-solid-state lithium batteries is an excellent inorganic solid electrolyte. Promising electrolytes are sulfide materials that exhibit higher conductivity and ductility than oxides and nitrides in lithium ion conductors [1]. Sulfide electrolytes are synthesized by conventional solid-state or mechanochemical synthesis methods in a vacuum or inert atmosphere. Recently, scalable liquid-phase synthesis has attracted much attention [2]. To further develop the liquid-phase synthesis of sulfide electrolytes, environmentally friendly solvents are needed. Here we demonstrate the synthesis of tin-based sulfide electrolytes using water as an environmentally friendly solvent instead of conventional organic liquids. First, Li4SnS4 was obtained from a mixture of Li2S, Sn, and S starting reagents by aqueous solution synthesis. Furthermore, Li10SnP2S12, a well-known LGPS-type superionic conductor [3,4], was synthesized by mixing an aqueous solution of Li4SnS4 with a tetrahydrofuran (THF) suspension of Li3PS4. The prepared Li10SnP2S12 exhibited the highest ionic conductivity of 5.9×10−3 S cm−1 at 25 °C among the liquid-phase syntheses reported so far. This study successfully demonstrated the efficient use of water in the synthesis of sulfide electrolytes.
This work was supported by JST ALCA-SPRING Grant Number JPMJAL1301 and GteX Program Grant Number JPMJGX23S5, Japan.
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