Lithium manganese iron phosphate positive electrode material as well as preparation method and application thereof

The invention provides a lithium manganese iron phosphate positive electrode material as well as a preparation method and application thereof. The lithium manganese iron phosphate positive electrode material comprises primary particles, the primary particles at least comprise an active material and an inert salt layer; wherein the inert salt layer covers the surface of the active material; the mass content of inert salt ions in the lithium manganese iron phosphate positive electrode material is less than 50ppm. By limiting the coating of the inert salt layer and the mass content of inert salt ions to be less than 50ppm, the lithium manganese iron phosphate positive electrode material which is proper in particle size, good in stability and capable of realizing continuous production can be obtained, so that a lithium ion battery prepared from the positive electrode material has excellent electrochemical performance. 本发明提供一种磷酸锰铁锂正极材料及其制备方法和应用，所述磷酸锰铁锂正极材料包括一次颗粒；所述一次颗粒至少包括活性材料和惰性盐层；其中，所述惰性盐层覆盖在所述活性材料的表面；所述磷酸锰铁锂正极材