Negative pole piece, preparation method thereof and sodium ion battery

The invention relates to the technical field of sodium-ion batteries, in particular to a negative pole piece, a preparation method thereof and a sodium-ion battery, and the negative pole piece comprises a modified negative active material which comprises a negative active material with the surface coated with polydopamine; the negative electrode current collector comprises a negative electrode current collector coated with a bottom coating on the surface, the negative pole piece comprises a modified negative active material or a negative current collector, the sodium ion battery comprises a modified negative electrode active material, a negative electrode current collector or a negative electrode plate. According to the invention, the bonding effect of the modified negative electrode active material and the negative electrode current collector with other components can be enhanced, the flexibility is improved, the problem of falling of the negative electrode active material caused by reduction of the adhesive