Lithium manganese iron phosphate as well as preparation method and application thereof

The invention relates to lithium manganese iron phosphate as well as a preparation method and application thereof, and belongs to the technical field of electrode materials. The preparation method comprises the following steps: W1, preparing ferromanganese oxide nanoparticles; w2, carrying out carbon coating on the ferromanganese oxide nano particles; and W3, sintering the manganese iron oxide nanoparticles subjected to carbon coating treatment to obtain the lithium manganese iron phosphate. The precursor solution provided by the invention contains acrylic acid and lithium acrylate which jointly act on manganese ions and ferrous ions through electrostatic repulsion and steric hindrance, so that a better dispersion effect is achieved; according to the preparation method of the lithium manganese iron phosphate, step-by-step ball milling is creatively used in a carbon coating link, lithium dodecyl sulfate and EDTA are sequentially added for ball milling, so that the thickness of a carbon coating layer is more un