High-performance NiMn2O4@MXene nanocomposites for aqueous zinc-ion battery

With the continuous consumption of lithium resources and the safety risks brought by organic electrolytes in lithium-ion batteries, aqueous zinc-ion batteries are expected to be the next generation of key energy storage devices to replace lithium-ion batteries. Among many zinc-ion battery cathode materials, manganese-based materials and MXene materials occupy the main positions respectively. Among them, Nickel manganate (NiMn2O4) nanosheets and MXene as active materials have received extensive attention. In addition, MXene has excellent electrical conductivity and is conducive to ion transport, and NiMn2O4 nanosheets provide more active sites for electrochemical reactions. At a current density of 0.2 A g- 1 , the NiMn2O4@MXene nanocomposite obtained a high specific capacitance of 319.9 mAh g- 1 . In addition, NiMn2O4@MXene nanocomposites showed A high specific capacity of 129.8 mAh g- 1 after 800 cycles at a current density of 0.5 A g- 1 . Therefore, NiMn2O4@MXene nanocomposites are expected to be a strong contender for the next generation of zinc-ion battery cathode materials in high energy density storage systems.