Preparation method of sodium titanate negative electrode material in hollow structure

The invention discloses a preparation method of a sodium titanate negative electrode material in a hollow structure and belongs to the field of sodium-ion batteries. The preparation method comprises the following steps: first, dissolving a sodium source in a mixed solution of distilled water, acetic acid and anhydrous ethanol, and adding a titanium source to obtain a sol; second, dispersing carbon balls in anhydrous ethanol to obtain a turbid liquid; and finally, fully dropwise adding the turbid liquid into the sol, and after reaction at a constant temperature, standing, drying and roasting to obtain the hollow sodium titanate negative electrode material. The hollow sodium titanate negative electrode material is great in specific surface. Compared with sodium titanate structures in bulky structures, the contact area of the material and the electrolyte is effectively increased and the migration distance of electrons and sodium ions in the material is shortened, so that the problem of poor rate capability and c