Conductive titanium compound coated lithium iron phosphate positive electrode material and preparation method thereof

The invention relates to a conductive titanium compound coated lithium iron phosphate positive electrode material and a preparation method thereof, and aims at providing excellent electric conductivity and lithium ion conduction property for lithium iron phosphate by adopting a conductive titanium compound as a coating. The material has a core-shell structure, a surface layer is the conductive titanium compound, and a core layer is lithium iron phosphate. The preparation method comprises the steps of (1) adding lithium iron phosphate and a titanium source into anhydrous ethanol, performing hydrolysis and spray drying, roasting the obtained powder under the protection of inert gas and cooling in a furnace; (2) adding the powder obtained in step (1) and a reducer into anhydrous ethanol, performing ultrasonic dispersion, drying, roasting under the protection of inert gas and cooling in the furnace; and (3) taking out the powder in a crucible, washing the powder with anhydrous ethanol and deionized water respectively, and finally, drying in a vacuum furnace to obtain a final product. By adopting the method, the particle size distribution of coated lithium iron phosphate is uniform, the coating has good electric conductivity and does not hinder the conduction of lithium ions, and the electrochemical performance of lithium iron phosphate can be effectively improved.