Electrochemical Insertion of Magnesium in Metal Oxides and Sulfides from Aprotic Electrolytes

Abstract

The electrochemistry of , , , , and has been studied in several organic solvents containing in view of their application as positive electrodes in rechargeable magnesium batteries. Only showed promising coulombic capacity and reversibility. Mg²⁺ insertion into this oxide depends on the ratio between the amounts of and Mg²⁺ as well as on the absolute amount of in the electrolyte. Water molecules preferentially solvating Mg²⁺ions appear to facilitate the insertion process. The highest coulombic capacities of up to 170 Ah/kg were reached in acetonitrile solutions containing .