Feb 10, 2022 · The Mg-air battery presented here consists of the Mg metal anode, the air cathode, and the molten salt electrolyte as shown in Fig. 2. The molten salt electrolyte consists of NaCl–KCl–MgCl 2 with ~0.5% MgO solubility. Moreover, its eutectic temperature and Mg melting point bound the operating temperature range of 420–620 °C.