▎ 摘　　要

NOVELTY - The composite comprises graphene and carbon, where surface of graphene is distributed with copper particle. Diameter of the copper particle is 50 nm or less. The carbon is selected from group of graphene structure carbon particle, fibrous carbon and carbon black. USE - Copper carbon composite for a magnesium cell positive active material composition (claimed) of a magnesium rechargeable battery. ADVANTAGE - The composite has better electrochemical property. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a method for manufacturing copper carbon composite (2) a magnesium cell positive active material composition. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a copper carbon composite.