NOVELTY - An exfoliated graphite flakes that are interconnected is provided, to form a porous conductive graphite network comprising pores. An electrochemically active material is filled into pores of graphite network, to obtain composite electrode. The composite electrode has specific surface area of 100 m2/g or more.    USE - Production of composite electrode such as graphite-carbon composite electrode is used for electrochemical capacitors for hybrid electric vehicles and electric car.    ADVANTAGE - The method economically and effectively provides composite electrode having high electroconductivity, energy density, pseudo-capacitance, chemical stability, specific surface area, and reduced internal resistance.    DETAILED DESCRIPTION - An exfoliated graphite flakes that are interconnected is provided, to form a porous conductive graphite network comprising pores. An electrochemically active material is filled into pores of graphite network, to obtain composite electrode. The composite electrode has specific surface area of 100 m2/g or more. The exfoliated flakes are obtained from laminar graphite material chosen from natural flake graphite, spheroidal graphite, synthetic graphite, highly oriented pyrolytic graphite, meso-carbon micro-bead, carbon or graphite fiber, carbon or graphite whisker, carbon or graphite nano-fiber, and/or carbon nano-tube. The step of filling electrochemically active material includes impregnating a precursor material into pores of network of exfoliated graphite flakes and converting precursor material to active material. The precursor is in a form of solution, suspension, sol-gel, monomer, polymer, aerogel, xerogel, polymer foam, organo-metallic molecule, coal tar pitch fluid, petroleum pitch fluid and/or meso-phase pitch fluid. The electrochemically active material is amorphous carbon, carbon aerogel, polymeric carbon, or carbon foam derived from a polymer, oxide, hydrous oxide, carbide, nitride and/or conducting polymer. The active material is functionalized with one or more functional groups chosen from quinone, hydroquinone, quaternized aromatic amine, mercaptan, or disulfide.    DESCRIPTION OF DRAWING(S) - The drawing shows flowchart illustrating formation of graphite-carbon composite electrode.