Composite Solid Electrolyte Na2SO4–Al2O3

Abstract

The effect of adding nanosized γ-Al₂O₃ on the properties and structure of Na₂SO₄ is studied using differential scanning calorimetry, vibrational spectroscopy, electrochemical impedance spectroscopy, and X-ray diffractometry. It is shown that the introduction of nanosized γ-Al₂O₃ to sodium sulfate considerably increases the ionic conductivity up to 8.48 × 10^–5 S/cm at 603 K. The results of X-ray diffraction and vibrational spectroscopic studies confirm the partial amorphization of the salt in the near-surface region of nanoparticles. The data obtained indicate that the sodium sulfate-based composite may be a promising ionic conductor for solid-state Na-ion batteries in the temperature range of 513–603 K.