Preparation method of spherical lithium manganese iron phosphate with high tap density

The invention provides a preparation method of spherical lithium manganese iron phosphate with high tap density, which comprises the following steps: step 1, respectively weighing an iron source, a manganese source (lithium manganese iron phosphate needs to be added), a lithium source, a phosphorus source, a carbon source and a doping agent according to a stoichiometric ratio, and efficiently and uniformly mixing by a dry method; 2, putting the uniformly mixed powder into a furnace protected by inert atmosphere, and carrying out high-temperature first sintering to obtain a lithium manganese iron phosphate sintering precursor; step 3, adding the lithium manganese iron phosphate sintering precursor and a carbon source into deionized water, mixing and dispersing uniformly, and grinding slurry obtained by mixing; and the magnetic suspension spraying equipment can directly granulate the slurry to a reasonable particle size range, so that the problem that the processing performance of lithium manganese iron phospha