▎ 摘　　要

NOVELTY - Sodium ion battery comprises anode sheet, cathode sheet, separator, electrolyte and packaging case, where the anode material of the anode sheet includes first conductive agent and the first additive in a weight ratio of 290-380. The first conductive agent is at least one of transition metal oxides, Prussian blue analogs and polyanionic anode materials, the first additive is acid compounds or acid anhydride compounds. USE - Sodium ion battery is used in power battery. ADVANTAGE - The sodium ion battery neutralizes the residual alkali on the surface of the anode material by adding acid compounds or acid anhydride compounds to the anode material, the alkalinity of the slurry is reduced, the stability of the slurry is improved, and the cycle performance of the battery is improved. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation method of the sodium ion battery. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of sodium ion battery. 1Cathode 2Diaphragm 3Anode