▎ 摘　　要

NOVELTY - A sandwich composite carbon electrode material preparing method involves mixing active coal dispersant with 0.1-3 % surfactant in water solution to obtain active coal suspension, dispersing graphene oxide in deionized water to obtain graphene suspension. The active coal suspension is mixed with the graphene suspension to obtain mixed suspension, which is stirred, filtered and dried to obtain active coal and graphite oxide composite material. The composite material is subjected to pore-forming process, reduction oxidation, neutralizing, filtering and drying to obtain a finished product. USE - Method for preparing sandwich composite carbon electrode material that is utilized in electric double layer capacitor. ADVANTAGE - The method enables preparing the electrode material with high mass ratio capacity, high volume ratio capacity, low internal resistance and high performance property.