Sulfide-based Na-ion solid electrolytes with high ionic conductivity are one of the most promising solid electrolytes for solid-state Na batteries. However, its poor chemical/electrochemical stability against Na metal leads to deterioration of interface. In addition, it is important to explore how to prepare sulfide-based composite membranes via solution method. Herein, Na3SbS4 is deposited on glassfiber framework via aqueous solution and further incorporated with trace of ionic liquid (IL). The Na3SbS4 composite pellets are well shaped avoiding the pressing process. The IL not only improves the Na3SbS4-Na interfacial stability, but also fills the pores between the framework and Na3SbS4 and thereby suppressing the dendrite formation. The Na plating/stripping tests on symmetric cells show polarization voltages lower than 0.1 V and stable cycling for more than 400 cycles under a current density of 0.1 mA cm(-2) at room temperature. The cycling performance of the FeS2 half-cells with the optimized electrolyte tested at 60 degrees C is superior to that with organic liquid electrolyte. [GRAPHICS] .