Nickel-Manganese-Based Layered Oxide for Sodium Ion Battery Cathode Materials

Sodium-ion batteries (SIBs) have demonstrated significant potential as alternatives to conventional lithium-ion batteries (LIBs) for modern grid and mobile energy storage applications, due to the abundant natural resources and low cost of sodium. Layered transition metal oxides (LTMOs) have attracted much attention due to their high specific capacities, energy densities as well as the compatible preparation processes with those of LIBs cathode materials. Among these, Ni/Mn-based LTMOs (NMLOs) are particularly noteworthy for their cost-effectiveness and superior electrochemical performance, such as excellent capacity retention, voltage stability, high operating voltage and rate capability. In this review, we briefly introduce the synthesis methods of NMLOs, discuss the challenges, and summarize the solutions. The insights presented may contribute to the development of NMLOs based SIBs.