We report a route for the synthesis of Na₃SbS₄–Na₂WS₄ superionic conductors from aqueous solution. Na₃SbS₄–Na₂WS₄ has the highest high sodium-ion conductivity (4.28 mS cm⁻¹ at 25 °C) of reported sulfide-based solid electrolytes prepared via liquid-phase methods. The antimony in Na₃SbS₄ is replaced by tungsten in a higher valence state, which is charge-compensated by sodium vacancies in the form Na_3−xSb_1−xW_xS₄. Introducing sodium vacancies while maintaining the 3D conduction pathways increases the pre-exponential factor in the Arrhenius plots of ionic conduction. The development of a facile synthetic protocol, as well as the high ionic conductivity and excellent chemical stability of Na₃SbS₄–Na₂WS₄ in the presence of water, is a major step towards the realization of all-solid-state sodium batteries.

中文翻译：

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Na ₃ SbS ₄ -Na ₂ WS ₄超离子导体的水溶液合成†

我们报告了从水溶液合成Na ₃ SbS ₄ -Na ₂ WS ₄超离子导体的途径。在通过液相方法制备的硫化物基固体电解质中，Na ₃ SbS ₄ -Na ₂ WS ₄具有最高的高钠离子电导率（25°C下为4.28 mS cm ^-1）。Na ₃ SbS _4中的锑被高价态的钨取代，并由钠空位以Na _{3− x} Sb _{1− x} W _x S ₄的形式进行电荷补偿。。在保持3D传导途径的同时引入钠空位会增加离子传导的Arrhenius图中的指数前因子。Na ₃ SbS ₄ -Na ₂ WS ₄在水存在下的简便合成方案的开发以及高离子电导率和出色的化学稳定性，是实现全固态钠电池的重要一步。