▎ 摘　　要

NOVELTY - A preparation method of high-performance nano-grade lithium iron phosphate anode material, involves (A) preparing divalent iron salt aqueous solution, phosphorus source aqueous solution, and hydrogen peroxide solution respectively, adding a certain stoichiometric ratio of divalent iron solution and phosphate aqueous solution to a reactor, controlling the concentration of the hydrogen peroxide solution, reacting, preparing iron (III) phosphate mixed solution with certain particle size distribution, filtering, washing, drying, and crushing to obtain spherical or quasi-spherical particles powdered iron phosphate intermediate, and (B) weighing the powdered iron phosphate intermediate of step (A), adding lithium source and carbon source, dissolving in pure water, grinding, spraying and drying the slurry, calcining, naturally cooling, and crushing using a crusher to obtain spherical or spherical lithium iron phosphate anode material. USE - Preparation method of high-performance nano-grade lithium iron phosphate anode material for preparing lithium iron phosphate battery. ADVANTAGE - The ferric phosphate intermediate is spherical or quasi-spherical particles with a particle size of nanometer to micrometer, and has excellent particle size distribution and highest compaction density of 2.6 g/cm3. The lithium iron phosphate anode material can simultaneously meet the electrical conductivity and high-pressure compaction density. DETAILED DESCRIPTION - A preparation method of high-performance nano-grade lithium iron phosphate anode material, involves (A) preparing divalent iron salt aqueous solution, phosphorus source aqueous solution, and hydrogen peroxide solution respectively, adding a certain stoichiometric ratio of divalent iron solution and phosphate aqueous solution to a reactor, controlling the concentration of the hydrogen peroxide solution, reacting at a stirring speed of 100-1000 rpm at 20-80degrees Celsius for 0.5-6 hours, preparing iron (III) phosphate mixed solution with certain particle size distribution, filtering, washing, drying, and crushing to obtain spherical or quasi-spherical particles powdered iron phosphate intermediate with compacted density of 2.35-2.65 g/cm3-2.6 g/cm3, and (B) weighing the powdered iron phosphate intermediate of step (A), adding lithium source and carbon source according to the ratio of 1:(1.01-0.02):(0.1-0.2), dissolving in pure water, grinding for 2 hours in a sand mill, spraying and drying the slurry, calcining at 700degrees Celsius for 12 hours and heating rate is 5degrees Celsius/minute under the protection of nitrogen atmosphere, naturally cooling to room temperature, and crushing using a crusher to obtain spherical or spherical lithium iron phosphate anode material with particle diameter of 3.8-8.34 m and measured compaction density of 2.42-2.6 g/cm3.