▎ 摘　　要

NOVELTY - Organic sodium-supplementing additive is chain organic compound. USE - Organic sodium-supplementing additive that is used for preparing positive pole piece for preparing sodium-ion battery (all claimed). ADVANTAGE - The organic sodium-supplementing additive is used for preparing positive electrode plate, and the positive electrode plate is applied in the sodium ion battery, in order to compensate the irreversible sodium ion loss caused by the formation of solid electrolyte interface film or the occurrence of side reactions during the formation process of the sodium ion battery, improve the actual capacity of the full battery, and realize the improvement of the cycle life and energy density of the sodium-ion battery. DETAILED DESCRIPTION - Organic sodium-supplementing additive is chain organic compound, which is CmH2m-7Na3O7, where m=4. INDEPENDENT CLAIMS are included for: (1)a method for preparing positive pole piece by using the organic sodium supplement additive, which involves: (a)dry-mixing the positive electrode active material, the organic sodium supplement additive, the first conductive additive and the positive electrode binder;(b) adding the mixture into a first solvent to obtain slurry;(c)coating uniformly the obtained slurry on a first current collector, and drying, where the mass of the organic sodium supplement additive is 5-40% based on the total mass of the positive electrode active material, the first conductive additive and the positive electrode binder; and (2)an application method of the positive pole piece for preparing sodium-ion battery, which involves: (a)preparing a positive pole piece, cutting the positive pole piece, preparing a negative pole piece, dry-mixing;(b)adding the negative active material, the second conductive additive and the negative binder into the second solvent to obtain slurry;(c)coating uniformly the obtained slurry on the second current collector, drying the slurry to obtain a negative pole piece, cutting;(d) preparing an electrolyte, dissolving sodium salt in an organic solvent to obtain an electrolyte, where the concentration of the electrolyte is 0.5-3 mol/L;(e) preparing a sodium ion battery, assembling orderly the positive pole piece, the diaphragm, the electrolyte and the negative pole piece, and preparing the sodium-ion battery through formation and standing processes. DESCRIPTION OF DRAWING(S) - The drawing shows a charge-discharge curve of the sodium ion half-cell assembled with the positive pole piece.