Preparation method of lithium iron phosphate with high conductivity and high tap density

The invention discloses a preparation method of lithium iron phosphate with high conductivity and high tap density. The method comprises the following steps: a Fe3+ source, a phosphorus source, a doping agent and a crystal form control agent are prepared into a mixed solution; the materials are slowly pumped into a magnetic stirring container equipped with a phosphoric acid solution in proportion,and the pH value is adjusted to 1.0-2.0 by ammoniacal liquor; at the same time, precipitate is heated and stirred in order to obtain a metal ion doped iron phosphate precursor; the iron phosphate precursor is filtered, washed and dried, and the precursor and a lithium source are uniformly mixed according to a mol ratio 1:1.02; under the protection of nitrogen-hydrogen gas mixture atmosphere, hightemperature treatment at 600-750 DEG C is carried out for 8-15 hours, in order to obtain metal ion doped lithium iron phosphate. The product has high conductivity and high tap density, and the methodhas the advantages of simp