PREPARATION METHOD FOR HIGH-RATE LITHIUM IRON PHOSPHATE POSITIVE ELECTRODE MATERIAL

A high-rate lithium iron phosphate positive electrode material and a production method thereof, comprising first, weighing an iron source and a lithium source in a molar ratio of 1:1-1:1.05, then weighing 5-15% of carbon source and 0-1% of metal ion doping agent based on the total mass of the iron source and lithium source, adding water to the above weighed materials, ball milling and sand grinding the obtained slurry, so that the D50 after the sand grinding is controlled to be 100-200 nm, then spraying the mixture to obtain a precursor, putting the precursor into a sintering furnace for sintering at 650-700 °C under the protection of nitrogen gas, cooling to obtain a sintered material, then pulverizing the sintered material, sieving the pulverized material and removing iron to obtain the lithium iron phosphate. The prepared lithium iron phosphate has a good rate capability and a good cycle stability, wherein 0.1 C discharge capacity thereof reaches 160mAh/g, and 10 C discharge capacity thereof reaches 140mAh/g. The microscopic morphology of the positive electrode material is a spherical-like particle, wherein the primary particle thereof has a mean value of 100 nm.