▎ 摘　　要

NOVELTY - A supercapacitor preparing method involves preparing the graphene oxide by the Hummers method and reducing the graphene oxide by heat treatment to form reduced graphene oxide, rapidly condensing carbon atoms of reduced graphene oxide without catalyst to obtain carbon nanohorn aggregates, preparing electrode comprises preparing slurry and coating, mixing reduced graphene with carbon nanohorn to prepare a slurry, the mass ratio of carbon nanohorn to the multilayer graphene sheet in the electrode is between 0.25 and 0.5, adding binder, coating the prepared slurry with an aluminum foil and drying to obtain the finished product, where the assembly of the supercapacitor, two of the electrodes are separated by a separator to form a sandwich structure and an electrolyte is injected to realize assembly of the supercapacitor. USE - Method for preparing supercapacitor. ADVANTAGE - The method enables preparing supercapacitor with improved the dispersibility and conductivity and high capacitance.