▎ 摘　　要

NOVELTY - The method involves preparing the graphene oxide, where the graphene oxide and a silicon alloy are added without the use of the dissimilar solvent in the water. The composite is manufactured, where the graphene oxide is coated on the silicon alloy. The graphene is returned for a unit of the graphene oxide, where another composite is manufactured. The graphene is coated on the silicon alloy, where the silicon alloy for alloying the graphene oxide and silicon alloy is provided with the ball milling. The surface of the silicon alloy is coated in the graphene oxide. USE - Method for manufacturing a cathode material. ADVANTAGE - The graphene oxide is prepared, where the graphene oxide and a silicon alloy are added without the use of the dissimilar solvent in the water, and hence ensures improving the lifetime and the reliability of a battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for manufacturing a lithium secondary battery. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic sectional view of a lithium secondary battery. Cathode (110) Anode (120) Electrolyte (130) Separation film (140) Lithium secondary battery (600)