Organic electrolyte, preparation method thereof and sodium ion battery

The invention provides an organic electrolyte, a preparation method thereof and a sodium-ion battery, and particularly relates to the technical field of sodium-ion batteries. The organic electrolyte comprises sodium salt, an organic solvent and a functional additive; the concentration of the sodium salt is 1.0 mol/kg to 3.0 mol/kg; the dosage of the functional additive is 0.3-5.0 wt.% of the total weight of the sodium salt and the organic solvent. The organic electrolyte provided by the invention is a high-concentration electrolyte, the number of free solvent molecules in the electrolyte is reduced, and sodium salt anions lead the generation of an electrode electrolyte interface film, so that an SEI film rich in inorganic matters is derived. The functional additive can respectively derive stable, compact and uniform interfacial films at the positive electrode interface and the negative electrode interface, so that the side reaction between the electrolyte and the electrode is reduced, the dissolution of trans