A nanoscaled Na₃SbS_3.75Se_0.25 solid electrolyte with less grain-boundary resistance was synthesized using a liquid/solid fusion technology. The Na₃SbS_3.75Se_0.25 solid electrolyte shows a high ionic conductivity of 4.03 × 10⁻³ S cm⁻¹ at room temperature due to the significantly decreased amorphous phase in the electrolyte. Moreover, the small particle size of the solid electrolytes enhances the contact between solid electrolyte and electrode, reducing the interfacial contact resistance. As a result, FeS₂/Na₃SbS_3.75Se_0.25/Na all-solid-state sodium batteries achieve a high specific capacity of 140.6 mAh g⁻¹ for 300 cycles at a high current of 500 mA g⁻¹. In addition, FeS₂/Na₃SbS_3.75Se_0.25/Na cells also demonstrate a high rate-capacity of 365.3, 301.8, 210.1 and 96.0 mAh g⁻¹ at current densities of 50, 300, 500 and 1000 mA g⁻¹, respectively. The liquid/solid fusion technology is a unique synthesis strategy to develop superionic electrolytes for room temperature all-solid-state sodium secondary battery.

使用液/固熔融技术合成了具有较低晶界电阻的纳米级Na ₃ SbS _3.75 Se _0.25固体电解质。Na ₃ SbS _3.75 Se _0.25固体电解质在室温下显示出4.03×10 ^-3  S cm ^-1的高离子电导率，这是由于电解质中非晶相的明显减少所致。而且，固体电解质的小粒径增强了固体电解质与电极之间的接触，降低了界面接触电阻。结果，FeS ₂ / Na ₃ SbS _3.75 Se _0.25/ Na全固态钠电池在500 mA g ^-1的大电流下可进行300次循环，具有140.6 mAh g ^-1的高比容量。此外，FeS ₂ / Na ₃ SbS _3.75 Se _0.25 / Na电池在电流密度分别为50、300、500和1000 mA g ^-1时也显示出365.3、301.8、210.1和96.0 mAh g ^-1的高倍率容量，分别。液/固熔融技术是开发用于室温全固态钠二次电池的超离子电解质的独特合成策略。