Electrochemical Intercalation of Mg²⁺ in Magnesium Manganese Silicate and Its Application as High-Energy Rechargeable Magnesium Battery Cathode

A study on electrochemical intercalation of bivalent cation Mg 2+ in magnesium manganese silicate is reported. Reversible Mg 2+ intercalation can be demonstrated and the process is enhanced by use of nanoscopic particles, resulted from a lower interfacial charge transfer resistance and a shorter solid-state diffusion distance of Mg 2+ in the host. As a step toward novel rechargeable magnesium battery system, we have demonstrated the feasibility of the electrochemical oxidation, reduction, and cycling of magnesium manganese silicate. The results show that the silicate compound could be a good host for Mg 2+ intercalation and a potential cathode material for high-energy rechargeable magnesium batteries.