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 magnesium ion batteries has gained significant attention. The focus is on enhancing high-rate performance and cycle stability, which has become the primary research goal. In order to alleviate the environmental problems caused by fuel vehicles, it is urgent to develop a new material to build an aqueous rechargeable magnesium ion battery with high safety, low production cost and high performance. 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-manganese oxide nanocomposite materials, 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 battery electrode material.