Cathode material for sodium-ion battery and preparation method of cathode material

The invention discloses a cathode material for a sodium-ion battery and a preparation method of the cathode material. The cathode material consists of a base and a laminated structure, wherein the base is coated with the laminated structure, and carbon material-vanadium oxide-carbon material is taken as a repeating unit. The preparation method comprises the following steps: firstly preparing a vanadium oxide colloidal solution and a carbon material aqueous solution, then coating the base with the carbon material aqueous solution in a spin manner and baking, then coating the base with the vanadium oxide colloidal solution in a spin manner and baking, then coating a layer of carbon material again, and repeating the above steps according to requirements, and finally drying to obtain the cathode material. The prepared electrode material is more beneficial to the intercalation capacity of sodium ions and excellent de-intercalation reversibility; the crystal structure of the vanadium oxide is larger in frame, so that intercalation of sodium ions is facilitated, the material structures are prevented from collapsing during the de-intercalation process of the sodium ions, the carbon material can promote the stretchability of the material, the damage to the material in the intercalation process of the sodium ions is reduced, and the practical capacity of the battery is improved greatly and the cycle life of the battery is greatly prolonged.