Iron phosphate, lithium iron phosphate positive electrode material and preparation method and application thereof

The invention belongs to the technical field of lithium batteries, and particularly relates to iron phosphate, a lithium iron phosphate positive electrode material and a preparation method and application thereof. The ferrous iron source and the copperas are jointly used as the iron source, the copperas can be used as the iron source and a doping agent by controlling the use amount of the ferrous iron source and the copperas, and impurity elements such as Ti, Mn and Mg contained in the copperas are introduced into iron phosphate as beneficial doping elements and then are introduced into the lithium iron phosphate positive electrode material; in the reaction process, a polymer monomer is polymerized on the surface of iron phosphate in situ, the particle size of the material is limited, precursor particles with more uniform particle size and morphology are obtained, and the electrochemical performance of lithium iron phosphate can be remarkably improved by means of uniform coating and doping. Besides, according