Improvements in the Electrochemical Performance of Sodium Manganese Oxides by Ti Doping for Aqueous Mg‐Ion Batteries

In recent times, the research on cathode materials for aqueous rechargeable magnesium ion battery has gained significant attention. The focus is on enhancing high-rate performance and cycle stability, which has become the primary research goal. Manganese oxide and its derived Na-Mn-O system have been considered as one of the most promising electrode materials due to its low cost, non-toxicity and stable spatial structure. This work uses hydrothermal method to prepare titanium gradient doped nano sodium manganese oxides, and uses freeze-drying technology to prepare magnesium ion battery cathode materials with high tap density. At the initial current density of 50 mA g^-1 , the NMTO-5 material exhibits a high reversible capacity of 231.0 mAh g^-1 , even at a current density of 1000 mA g^-1 , there is still 122.1 mAh g^-1 . It is worth noting that after 180 cycles of charging and discharging at a gradually increasing current density such as 50-1000 mA g^-1 , it can still return to the original level after returning to 50 mA g^-1 . Excellent electrochemical performance and capacity stability show that NMTO-5 material is a promising electrode material.