Lithium iron phosphate positive electrode material, preparation method and application

The invention provides a lithium iron phosphate positive electrode material, and a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing and stirring phosphoric acid and carbon black to form a suspension liquid; s2, iron powder is weighed, half of the iron powder is added into the suspension liquid obtained in the step S1, stirring is conducted to enable iron to be completely dissolved, and a ferrous dihydrogen phosphate solution is generated; adding the other half of the iron powder into a ferrous dihydrogen phosphate solution, and stirring for reaction to obtain blue precipitate coated on the surface of the carbon black, namely ferrous dihydrogen phosphate; s3, adding lithium carbonate into the solution obtained in the step S2, stirring for reaction, and generating a mixture of lithium phosphate and ferrous phosphate when blue precipitates on the surface of the carbon black become a mixture of grey blue and white precipitates; and S4, calcining the lith