Modified sodium ferric sulfate positive electrode material as well as preparation method and application thereof

The invention discloses a modified sodium ferric sulfate positive electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion batteries, the preparation method comprises the following steps: step S1, mixing graphene oxide, a sodium source, an antioxidant, a ferrous source, a sulfur source and water to obtain a mixed material; s2, performing vacuum freeze drying on the mixed material, and performing primary crushing to obtain a precursor; and S3, carrying out microwave sintering on the precursor, and carrying out secondary crushing to obtain the modified sodium ferric sulfate positive electrode material, the microwave sintering is performed at the temperature T1 and the temperature T2 in sequence; wherein T1 ranges from 200 DEG C to 250 DEG C, the heat preservation time at the temperature of T1 ranges from 10 min to 15 min, T2 ranges from 320 DEG C to 380 DEG C, and the heat preservation time at the temperature of T2 ranges from 12 min to 24 min. Accord