Manganese-doped cobaltosic tetroxide and preparation method and application thereof

A preparation method of a manganese-doped cobaltosic tetroxide,

• comprising the following steps of:
• (1) preparing an ammonium bicarbonate solution as a base solution in a reaction vessel under a protective atmosphere and a pressure of 0.1 MPa to 0.5 MPa, wherein a volume ratio of the base solution in the reaction vessel is 40% to 50%, and a pH value is 8 to 8.5;
• (2) adding a mixed metallic solution and a precipitant into the reaction vessel in a steady pressure state for mixing, controlling a pH of the obtained mixed solution to decrease at a rate of 0.08 pH/h to 0.12 pH/h to a pH of 7.3 to 7.6 for reaction until a volume ratio of the mixed solution in the reaction vessel reaches 70% to 80%, and the mixed solution starts to concentrate and precipitate;
• during the concentration and precipitation period, continuously introducing the mixed metallic solution and the precipitant to steady the volume ratio of the mixed solution in the reaction vessel;
• and stopping the reaction when a particle size of particles obtained by concentration and precipitation reaches 4 μm to 6 μm to obtain a manganese-doped cobalt carbonate particle slurry;
• wherein the mixed metallic solution comprises a cobalt salt, a divalent manganese salt, a crown ether surfactant and a nonionic surfactant, and a mass ratio of the crown ether surfactant to the nonionic surfactant and a manganese element in the divalent manganese salt is (0.02 to 0.08):(0.02 to 0.08):1;
• (3) after filtering the manganese-doped cobalt carbonate particle slurry, washing with an antioxidant solution for 10 minutes to 30 minutes, then drying and sieving to obtain a manganese-doped cobalt carbonate precursor;
• and
• (4) sintering the manganese-doped cobalt carbonate precursor at 650° C. to 680° C. for 3 hours to 5 hours to obtain the manganese-doped cobaltosic tetroxide.