Preparation method of carbon-coated lithium iron phosphate nanometer composite material

The invention discloses a preparation method of a carbon-coated lithium iron phosphate nanometer composite material. The method comprises the following steps: preparing an amphiphilic carbon material and ethylene glycol to suspension, adding a lithium source including lithium hydroxide, a phosphorus source including phosphoric acid and a ferrum source including ferrous sulfate into the suspension, stirring to react the ingredients, putting the ingredients in a high temperature reaction kettle to perform a solvent thermal reaction, and putting the ingredients in a carbonization furnace to perform heat treatment to obtain the carbon-coated lithium iron phosphate nanometer composite material with granule size of 30-100 nm. The preparation method disclosed by the invention has the advantages that the synthesis process is simple, the process conditions are easy to control and are free of environmental pollution; the prepared carbon-coated lithium iron phosphate nanometer composite material is good in orientation, few in defects and high in crystallinity and has good large-current charge and discharge performance and stable circulation performance when being used as anode materials of lithium ion batteries.