All solid state rechargeable aluminum–air battery with deep eutectic solvent based electrolyte and suppression of byproducts formation

In order to create a rechargeable aluminum (Al)-air battery, an aluminum-air battery with a deep eutectic solvent-based solid electrolyte was prepared. The prepared battery demonstrated a capacity smaller than the theoretical value although we observed stable electrochemical reactions. When TiN was used as an air cathode material, byproducts of the aluminum-air battery such as Al(OH)₃ and Al₂O₃ were not detected on either the Al anode nor the air cathode. Even though we did not detect byproducts, we observed NaCl and NH₄Cl phases on the air cathode, and they did not hinder the electrochemical reaction.