Fig. 3. Interactions between components in the PEO-based all-solid-state electrolytes. (a) Sb 3d XPS spectra and (b) Raman spectra of the PEO/Na₃SbS₄ and PEO/NaTFSI/Na₃SbS₄ electrolyte. (c) Raman spectra and (d) XRD patterns of the PEO/NaTFSI electrolyte and PEO/NaTFSI/Na₃SbS₄ electrolyte. Inset: corresponding DSC curves.