Doped sodium ferric fluorophosphate positive electrode material and preparation method thereof

• Main Authors: XIE YUXIANG, FAN CHANGQIU, LIU HONGYANG
• Format: Patent
• Language: Chinese; English
• Published: 17.05.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to the technical field of batteries, and discloses a doped sodium ferric fluorophosphate positive electrode material and a preparation method thereof.The preparation method comprises the steps that cobalt serves as a doping element and is subjected to a co-precipitation reaction with iron sources such as ferric chloride and oxalic acid, then graphene-grafted ammonium polyphosphate serves as a phosphorus source, high-temperature calcination is conducted, and graphene-coated doped iron phosphate is obtained; and finally, reacting with sodium acetate and sodium fluoride to obtain the graphene-coated doped sodium ferric fluorophosphate positive electrode material, so that the graphene uniformly coats the doped sodium ferric fluorophosphate positive electrode material. As an active substance of a sodium ion positive electrode, cobalt is doped with iron lattices in sodium ferric fluorophosphate, the diffusion coefficient of sodium ions of the positive electrode material is improved, transmissi