The invention belongs to the technical field of
sodium ion battery positive
electrode materials, and discloses a
sodium ferrous sulfate positive
electrode material and a preparation method thereof, and the preparation method of the
sodium ferrous sulfate positive
electrode material comprises the following steps: step 1, preparing a
ferrous sulfate precursor; 2, mixing the ferrous sulfate precursor with a sodium source, iron-containing sulfate, an M source and a
carbon source, and then
sintering and crushing to obtain a sodium ferrous sulfate positive
electrode material; wherein the specific method of the step 1 is as follows: an
iron source and a hydrophilic
modified carbon material are added into deionized water and stirred to obtain uniform
slurry, then the
slurry is subjected to
spray drying to obtain a ferrous sulfate precursor, and the
mass ratio of the
iron source to the hydrophilic
modified carbon material is (9-19): 1; the M source is a Mn source or a mixture formed by the Mn source and at least one of a Mg source, a Ti source and a Zn source; the chemical general formula of the sodium ferrous sulfate positive
electrode material is NaxFeyMz (SO4) x / 2 + y + z, wherein x is greater than or equal to 1 and less than or equal to 3, y is greater than or equal to 0.1 and less than or equal to 2, and z is greater than or equal to 0.1 and less than or equal to 1. According to the invention, the morphology of the obtained sodium ferrous sulfate positive
electrode material is controlled by firstly preparing the ferrous sulfate precursor, so that the
electrical performance is improved.