Preparation method of low-temperature high-nitrogen-doped sodium ion battery anode material

The invention belongs to the technical field of sodium ion batteries, and in particular relates to a preparation method of a low-temperature nitrogen-doped sodium ion battery anode material. The preparation method at least comprises the following steps: dividing corn straw into corn husk and corncob, grinding the corn husk into powder, and thoroughly drying; dipping into a polytetrafluoroethylene(PTFE) reaction kettle containing a dilute sulfuric acid aqueous solution, washing until neutral, thoroughly drying, and then fully grinding; transferring the product into a high temperature tube furnace, heating up to 1100-1300 DEG C, carrying out heat preservation for 1-6 h, and naturally cooling to the room temperature; soaking the product in a mixed solution of nitric acid and hydrogen peroxide, continuously stirring, then adding distilled water with the same volume, continuously stirring, then washing the obtained sample, and fully drying; transferring the dried sample into an ethylenediamine solution, heating up