Preparation method for Prussian blue sodium-ion battery positive electrode material

A preparation method of a positive electrode material for Prussian blue analogue sodium ion battery, comprising steps of:

• adding a first nonionic surfactant and an antioxidant to a sodium ferrocyanide solution to obtain a first solution;
• adding a second nonionic surfactant to a transition metal salt solution to obtain a second solution;
• under a protective gas atmosphere, adding the second solution to the first solution for precipitation reaction, aging after the reaction is finished, collecting a precipitate, and washing;
• and
• vacuum drying the washed precipitate, then soaking in an alcohol solution containing sodium alkoxide, filtering, and evaporating to dryness to obtain a positive electrode material for Prussian blue analogue sodium ion battery;
• wherein the first nonionic surfactant and the second nonionic surfactant are independently one or both of polyethylene glycol and polyoxyethylene alkyl amide alcohol;
• the first nonionic surfactant is the same as the second nonionic surfactant;
• molecular weights of the first nonionic surfactant and the second nonionic surfactant are both ≥1500 g/mol;
• a concentration of the first nonionic surfactant in the first solution and a concentration of the second nonionic surfactant in the second solution are both 0.001-0.1 mol/L.