Publication date: 10th April 2024
Sulfide solid electrolytes hold great promise for all-solid-state sodium batteries due to their superior ionic conductivities.
In this study, we propose a novel synthesis approach utilizing sodium polysulfides (Na2Sx) as a self-flux, eliminating the need for delicate sulfide precursors[1-3]. Na2Sx melts showed low vapor pressure of sulfur and efficiently reacts with raw materials, including single elements, under ambient pressure conditions, thus obviating the requirement for sealed reaction vessels [1]. Using this technique, we successfully synthesized crystalline Na2.88Sb0.88W0.12S4 [1] and glassy Na3BS3 [1, 2] and Na4SiS4-based solid electrolytes [3]. The Na2.88Sb0.88W0.12S4 exhibited an extremely high ionic conductivity of 125 mS cm−1 at 25 °C [1]. Glassy Na3BS3 and Na4SiS4-based solid electrolytes exhibited high reduction stability, and thus they were useful for the buffer layer to suppress side reaction between negative electrode and solid electrolyte [1-3]. This synthesis strategy holds significant promise for advancing the development of high-performance solid electrolytes for all-solid-state sodium batteries.
This work was supported by JSPS KAKENHI Grant Numbers JP21H04701 and JP23H02071.
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