▎ 摘　　要

NOVELTY - The method involves: (a) dissolving soluble iron source and phosphate in water, adjusting pH to 1.0-3.0, then adding oxidant for oxidation, filtering, and drying to obtain nano-spherical or quasi-spherical iron (III) phosphate intermediate, (b) respectively dissolving manganese source, iron source and phosphorus source in water solution, adding ammonia water to adjust the pH to 1.0-3.0, then adding oxidant, then drying to obtain iron manganese phosphate (MnxFe1-xPO4 ) intermediate with compacted density of 2.4-3.2 g/cm3, and (c) mixing the iron (III) phosphate intermediate, MnxFe1-xPO4 intermediate and lithium source, carbon source and solvent at a ratio of 1: 1: 1.01: 0.03: 1, then grinding, spray drying, calcining, finally naturally cooling to room temperature, and crushing to obtain spherical or quasi-spherical nano lithium iron manganese phosphate anode material with grain diameter of 200-1200nm and compacted density of 2.4-2.6g/cm3. USE - Preparation method of high voltage solid lithium iron manganese phosphate anode material for preparation of lithium ion battery used in energy automobile. ADVANTAGE - The method enables to prepare high voltage solid lithium iron manganese phosphate anode material, which improves the utilization rate of the raw material, reduces the rejection, and provides good raw material for the preparation of the lithium ion battery. DETAILED DESCRIPTION - The method involves: (a) dissolving soluble iron source and phosphate in water, using ammonia water, sodium hydroxide, calcium hydroxide and/or calcium carbonate to adjust pH to 1.0-3.0, then adding oxidant for oxidation, reacting for 2-3 hours, filtering, drying filter cake for 10-12 hours under 75-90degrees Celsius to obtain nano-spherical or quasi-spherical iron (III) phosphate intermediate with particle size distribution of 10-600 nm, and compaction density of 1.96-2.18 g/cm3, (b) respectively dissolving manganese source, iron source and phosphorus source in water solution, according to MnxFe1-xPO4 needed mol ratio, measuring ratio x: 1-x: 1 equal to 0.4-0.9: 1-0.4-0.9: 1, stirring for 0.5 hours, adding ammonia water to adjust the pH to 1.0-3.0, then adding oxidant for oxidation reaction at 40-80degrees Celsius for 1-3 hours, filtering, using deionized water to wash the filter cake, removing impurities, then drying in 40-80 drying box for 12 hours to obtain particle size distribution of 500-700 nm MnxFe1-xPO4 intermediate with compacted density of 2.4-3.2 g/cm3, (c) according to the requirement of the compacted density, mixing the iron (III) phosphate intermediate, MnxFe1-xPO4 intermediate and lithium source, carbon source and solvent at a ratio of 1: 1: 1.01: 0.03: 1, then grinding for 1-3 hours to form slurry in the sand mill, spray drying the slurry, calcining at 300-800degrees Celsius for 6-20 hours under the protection of nitrogen atmosphere at heating speed of 5degrees Celsius/minute, finally naturally cooling to room temperature, using a crusher to crush to obtain spherical or quasi-spherical nano lithium iron manganese phosphate anode material with grain diameter of 200-1200nm and compacted density of 2.4-2.6g/cm3.