High-entropy layered oxide sodium ion battery positive electrode material and preparation method and application thereof

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a high-entropy layered oxide sodium ion battery positive electrode material and a preparation method and application thereof.The preparation method comprises the steps that a nickel source, a manganese source, a titanium source and a zirconium source are mixed, a sodium source is added, ball milling and vacuum drying are conducted, then high-temperature calcination is conducted, and an O3-phase layered high-entropy oxide material NaNi0. 45Mn0. 3Ti0. 2Zr0. 05O2 (can be abbreviated as a NaNMTZ positive electrode material) is obtained; the preparation method comprises the following steps: mixing a NaNMTZ material, a carbon source, an inorganic substance and an organic solvent, magnetically stirring, carrying out rotary evaporation to remove the organic solvent, carrying out heat treatment on the obtained mixture to remove the inorganic substance, and carrying out centrifugal washing and vacuum drying to obtain the n