Preparation of sodium-ion-conductive Na3-xSbS4-xClxsolid electrolytes

Abstract

Solid electrolytes have become important materials for improving the performance of next-generation all-solidstate sodium rechargeable batteries. Therefore, sodium vacancy doping for Na3SbS4electrolytes was performed by partially substituting Cl for S. Na3-xSbS4-xClxelectrolytes were prepared using a mechanochemical process and consecutive heat treatment. The structures, ionic conductivities, and air safety of the prepared Na3-x- SbS4-xCxl electrolytes were evaluated via X-ray diffraction and impedance, air stability, and electrochemical tests. The Na2.9375SbS3.9375Cl0.0625electrolyte showed a higher room-temperature ionic conductivity of 2.9 × 10-3Scm-1than that of the Na3SbS4electrolyte. An all-solid-state Na15Sn4/Na2.9375SbS3.9375Cl0.0625/TiS2cell showed a reversible capacity of approximately 100mAh g-1at room temperature. Thus, the Na2.9375SbS3.9375Cl0.0625solid electrolyte has the potential for application as a solid electrolyte in all-solid-state batteries.