Lithium iron phosphate and preparation method thereof

The invention discloses a preparation method of lithium iron phosphate. The preparation method comprises the following steps: respectively adding an iron source, a lithium source and a phosphorus source according to a certain substance amount ratio and a certain sequence in a dispersion medium, uniformly stirring, then adding a proper amount of organic carbon source, and preparing a lithium iron phosphate precursor slurry; putting a prefabricated AAO template with appointed aperture distribution in a sealed vessel, pumping out air in the AAO template through a vacuum air pump filtration machine, then pouring the lithium iron phosphate precursor slurry into holes of the AAO template under the negative pressure action, and carrying out vacuum drying; and sintering the AAO template loading a lithium iron phosphate precursor at a certain atmosphere, and removing the AAO template with an NaOH solution to prepare a the lithium iron phosphate with a nanowire array morphology. According to the preparation method, the