The invention provides a method for modifying the surface of a 
lithium cobaltate positive 
electrode material with a 
phosphorus-containing compound and the 
lithium cobaltate positive 
electrode material, comprising the following steps: step 1, using a layered 
lithium cobaltate 
powder material as a matrix, and  Compounds are ball milled and mixed according to a certain ratio to obtain a mixed 
powder material; step 2, heat the mixed 
powder material in an 
atmosphere protection environment to obtain a modified lithium cobaltate positive 
electrode material, the interior of which is lithium cobaltate, and the near surface  Including 
lithium cobalt oxide lattice and 
phosphate root to form a bond, the surface includes an amorphous 
coating layer composed of 
metal ions and 
phosphate groups.  The invention adopts 
process control and treatment of mixing and heating the 
phosphorus-containing compound and lithium cobaltate to modify the surface of lithium cobaltate particles, and utilizes the 
doping of 
phosphate on the surface lattice to enhance the stability of lithium cobaltate structure  ; and effectively protect the electrode 
electrolyte interface by containing an amorphous 
coating layer, reduce interface side reactions, and improve rate performance and cycle performance.