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

Abstract

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.