Abstract
All-solid-state sodium-ion batteries using inorganic solid electrolytes containing abundant sodium are promising candidates for large-scale energy storage applications. Solid electrolyte materials that exhibit high ionic conductivity and electrochemical stability and are produced by simple synthesis routes are required for use in all-solid-state batteries. In this work, we report the characterization of multiphase Na3SbS4 that contains both tetragonal and cubic phase structures. We found that Na3SbS4 synthesized via a liquid-phase reaction method had a tetragonal crystal structure, which was converted to the cubic phase through post-treatment by ball milling. The ionic conductivity of the multiphase Na3SbS4 was high, about 3.1 mS cm−1 at room temperature.
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