Thermal synthesis and structural evolution of Na2.88Sb0.88W0.12S4 solid electrolyte

Sodium solid state batteries are one of the very few viable solutions for energy storage for stationary systems. Several solid electrolytes are reported with impressive ionic conductivity up to 40 mS/cm, among them the Na2.88Sb0.88W0.12S4. To date, the synthesis of this solid electrolyte is poorly described and deserve a proper investigation to understand Na-ion transport mechanism. We propose to study the phase formation and transitions upon temperature (up to 550 °C) of the Na2.88Sb0.88W0.12S4 by collecting X-ray diffractograms of mechanochemically pretreated reactants.