Preparation method for cathode material of lithium iron phosphate battery

The invention provides a preparation method for a cathode material of a lithium ion phosphate battery. The method comprises the following steps of: 1) preparing a lithium iron phosphate/carbon nano tube compound through in-situ reaction by a hydrothermal method; 2) granulating the lithium iron phosphate/carbon nano tube compound to obtain micro particles of 1-10 micrometers; and 3) cladding a graphene nano sheet on the compound by using a powder mixing machine, and mixing a compound electrode material with a binding agent to obtain the cathode material of the lithium battery. In the lithium iron phosphate/carbon nano tube compound prepared according to the method, carbon nano tubes are uniformly dispersed, and the conductivity of lithium iron phosphate is favorably improved. The cathode material provided by the invention is high in conductivity and high in tapping density, a high-capacity battery can be prepared, the preparation process is simple, controllability is high, and the requirement for mass production can be met.