▎ 摘　　要

NOVELTY - Method for preparing a graphene-carbon nanotube composite involves (1) controlling the shape of graphene oxide (GO) by mixing a surfactant and GO, (2) reducing the shape-controlled GO, (3) modifying the surface of the reduced GO and the surface of a carbon nanotube and (4) mixing the surface-modified reduced GO and the surface-modified carbon nanotube. USE - The method is useful for preparing a graphene-carbon nanotube composite used in an electrode used for a secondary battery (all claimed). ADVANTAGE - The method has no performance degradation according to the number of charges and discharges and can manufacture a high-capacity/high-life lithium secondary battery without performance degradation, when the composite is included as an anode material of a lithium secondary battery, a charging capacity (475 mAh/g) more than twice that of a currently developed product may be exhibited. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the composite prepared by the method.