Magnesium Electrodes

Abstract

High-voltage, oxide-based insertion cathodes are commercial favorites for lithium-ion batteries. However, due to the double charge density, the magnesium cation (Mg2+) tends to bond covalently with the oxygen in the electrode structure which precludes its smooth and reversible intercalation. With the exception of lithium titanate, reversible magnesium intercalation has only been reported for sulfide-based electrodes which offer a low energy densityenergy density due to low voltage and capacity. However, higher reversibility and energy density have been reported with conversion cathodes such as selenium and iodine. The current challenge for the development of a suitable cathode for a rechargeable magnesium batterymagnesium battery with a metal anode is improving the rates of battery charge/discharge as well as increasing the cycle life. The use of modern magnesium electrolytesmagnesium electrolytes will accelerate this effort.