NOVELTY - The carbon cohesive assembly prepared by the method is claimed, where the method comprises obtaining carbon in the form of powder, particles, flakes or loose agglomerates, dispersing the carbon in a liquid halogen by mechanical mixing followed by sonication in a prescribed ratio of carbon: halogen (4-10 mg of carbon per milliliter of bromine), and removing the liquid halogen in a controlled manner by evaporation at a pressure of 10-0.1 Torr, where the cohesive assembly of carbon is formed. The liquid halogen is bromine and iodine. The liquid halogen is free of surfactant.    USE - The single-walled carbon nanotubes cohesive assembly is useful: in an energy storage device such as a capacitor, a fuel cell and a battery (all claimed); and as an electrode or a current collector.    ADVANTAGE - The thin and flexible single-walled carbon nanotubes cohesive assembly exhibits good mechanical strength and integrity, high carbon packing density, performance and surface area, excellent energy storage capabilities, low electrical resistivity and improved resistance to chemical attack and resistance to high temperatures, and provides the simple and reduced weight of the energy storage devices with high performance.    DETAILED DESCRIPTION - The carbon cohesive assembly prepared by the method is claimed, where the method comprises obtaining carbon in the form of powder, particles, flakes or loose agglomerates, dispersing the carbon in a liquid halogen by mechanical mixing followed by sonication in a prescribed ratio of carbon: halogen (4-10 mg of carbon per milliliter of bromine), and removing the liquid halogen in a controlled manner by evaporation at a pressure of 10-0.1 Torr, where the cohesive assembly of carbon is formed. The liquid halogen is bromine and iodine. The liquid halogen is free of surfactant, and is heated at 40-80 degrees C. The cohesive assembly is heated to remove residual halogen that is chemically or physically bonded to the carbon of the assembly, treated with a halogen gas to remove non-carbon impurities that are chemically or physically bonded to the carbon of the assembly, and coated with metal particles, and has a carbon packing density of 1.5 g/cm and an electrical resistivity lower than 5 x 10-4 Omega -cm. INDEPENDENT CLAIMS are included for:    (1) a capacitor;    (2) a fuel cell;    (3) a battery; and    (4) an energy storage device.    DESCRIPTION OF DRAWING(S) - The figure shows an optical image of a carbon nanotubes cohesive assembly.