▎ 摘　　要

NOVELTY - Preparation of graphene oxide-sodium ion positive electrode composite material involves dissolving nano graphene oxide in deionized water, dispersing to obtain nano graphene oxide dispersion liquid, hydrothermally reacting to obtain a three-dimensional graphene oxide precursor, freeze-drying the precursor to obtain three-dimensional graphene oxide, dipping in dopamine aqueous solution, dispersing, heating to obtain dopamine modified three-dimensional graphene oxide dispersion liquid, adding transition metal salt solution, dispersing to obtain three-dimensional graphene oxide dispersion liquid chelating and adsorbing transition metal ions, dissolving polyvinylpyrrolidone and sodium ferrocyanide in deionized water, stirring and dispersing to obtain graphene oxide-transition metal salt-sodium ferrocyanide mixed raw material solution, stirring the mixed raw material solution, hydrothermally reacting, cooling, filtering, washing and drying. USE - Preparation of graphene oxide-sodium ion positive electrode composite material (claimed) for battery. ADVANTAGE - The method reduces crystal defect of Prussian blue-like materials, reduces hydration defect, and improves the performance of battery. DETAILED DESCRIPTION - Preparation of graphene oxide-sodium ion positive electrode composite material involves dissolving nano graphene oxide in deionized water, ultrasonically dispersing uniformly to obtain nano graphene oxide dispersion liquid, performing hydrothermal reaction for 2-4 hours at 120-150℃ to obtain a three-dimensional graphene oxide precursor, freeze-drying the precursor to obtain three-dimensional graphene oxide, dipping the three-dimensional graphene oxide in dopamine aqueous solution, ultrasonically dispersing for 4-6 hours, heating at 40-60℃ for 30-60 minutes to obtain a dopamine modified three-dimensional graphene oxide dispersion liquid, adding transition metal salt solution into the dispersion liquid, ultrasonically dispersing to obtain three-dimensional graphene oxide dispersion liquid chelating and adsorbing transition metal ions, dissolving polyvinylpyrrolidone and sodium ferrocyanide in deionized water, stirring and dispersing for 2-3 hours to obtain graphene oxide-transition metal salt-sodium ferrocyanide mixed raw material solution, continuously stirring the mixed raw material solution for 20-40 minutes, hydrothermally reacting for 6-8 hours at 80-100℃, cooling to room temperature, filtering, washing and drying.