▎ 摘　　要

NOVELTY - A cathode material preparing method involves adding graphene powder in mixed solution of concentrated sulfuric acid and concentrated nitric acid at 50-100 degrees C, stirring for 1-10 hours, standing for 10-20 hours, cleaning with deionized water till the solution is neutral and ultrasonically treating for 1-4 hours with carboxyl functional group. The resultant product is added to a mixture containing 0.5-2 mass parts of magnesium chloride and water, followed by adding carrying carboxyl functional group, and dispersing ultrasonically to obtain magnesium chloride with carboxyl functional group. USE - Method for preparing cathode material that is utilized for manufacturing a lithium ion battery. DETAILED DESCRIPTION - A cathode material preparing method involves adding graphene powder in mixed solution of concentrated sulfuric acid and concentrated nitric acid at 50-100 degrees C, stirring for 1-10 hours, standing for 10-20 hours, cleaning with deionized water till the solution is neutral and ultrasonically treating for 1-4 hours with carboxyl functional group. The resultant product is added to a mixture containing 0.5-2 mass parts of magnesium chloride and water, followed by adding carrying carboxyl functional group, dispersing ultrasonically to obtain magnesium chloride with carboxyl functional group, evaporating solvent material, treating at 800-1200 degrees C, stirring mixture and sealing in a cavity. The resultant product is vacuumized, followed by treating at a vacuum degree of 150 Pa under mixed gas of argon gas and hydrogen in a volume ratio of 3:6 at 500-1000 degrees C for 5-20 minutes, stopping inletting carbon-containing gas, maintaining resultant product under argon gas and hydrogen atmosphere for 1-6 hours and cooling to room temperature under the protection of the argon gas to obtain a finished product.