▎ 摘　　要

NOVELTY - Nano/micro composite fiber capable of storing electrical energy, comprises: (a) at least one pair of microfiber bundles (1) consisting of graphene or graphene/carbon nanotube as an electrode active material; (b) nanofiber web (2) surrounding the microfiber bundles, where the nanofiber web is coated by at least one material comprising metal, carbon nanotube, activated carbon or metal oxide nanoparticle; (c) an electrolyte layer surrounding the nanofiber web and filling inner voids of the microfibers and nanofiber web; and (d) an insulating film sheathing the electrolyte layer. USE - The composite fiber capable of storing electrical energy is useful in high performance supercapacitor. ADVANTAGE - The nano/micro composite fiber: utilizes fiber bundle which has high electrical conductivity and specific surface area and acts as an electrode active material and/or an electrode of a supercapacitor; when graphene is heated at 80-85 degrees C for 1 hour in 4 M sulfuric acid, has a capability of increasing electrical energy storage by 44 times; exhibits improved mechanical properties, electrical conductivity, energy output density, and energy storage density; and exhibits increased toughness and mechanical strength. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for fabricating the nano/micro composite fiber, comprising (a) wet spinning an aqueous dispersion of graphene or graphene/carbon nanotube to prepare a microfiber, (b) bundling the microfibers to prepare microfiber bundle, (c) wrapping the microfiber bundle with a nanofiber web to prepare a nano/micro composite fiber, where the nanofiber web is coated with at least one material comprising metal, carbon nanotube, activated carbon or metal oxide nanoparticle, (d) impregnating the nano/micro composite fiber with an electrolyte (4) to form an electrolyte layer, (e) twisting at least one pair of electrolyte-coated nano/micro composite fibers, and (f) sheathing the electrolyte-coated nano/micro composite fiber with insulating material. DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of a nano/micro composite fiber capable of storing electrical energy. Microfiber bundles (1) Nanofiber web (2) Functional material (3) Electrolyte (4)