METHOD FOR PREPARING LITHIUM IRON PHOSPHATE BY RECYCLING WASTE BATTERIES

A method of preparing lithium iron phosphate by recycling and utilizing waste batteries. The method may include pre-processing a waste lithium iron phosphate battery to obtain lithium iron phosphate powder, adding alkaline liquid to the lithium iron phosphate powder, and filtering to obtain a filter residue: an iron source, a lithium source or a phosphorus source to the filter residue, and performing ball milling to obtain a ball-milled product; preparing a carbon source solution, and adding a surfactant to the carbon source sol ion to obtain a mixed solution; mixing the ball-milled product and the mixed solution, performing spray pyrolysis to obtain a high-temperature powder, spraying atomized water to the high-temperature powder to remove impurities, and then calcining to obtain a finished product of lithium iron phosphate.