▎ 摘　　要

NOVELTY - A flexible carbon fiber producing method involves obtaining and immersing pure cotton thread in aqueous solution-containing ethanol for 1-24 hours. Impurities are removed and dried at 60-100 degrees C for 5-24 hours. Carbon nanotubes and/or graphene are dispersed in a solvent to obtain slurry with various concentration. The pure cotton thread is impregnated with the slurry and dried to obtain fiber precursor. The fiber precursor is heat-processed under inert atmosphere, where graphene is supported on fine fiber surface of cotton thread and protected under inert atmosphere. USE - Method for producing flexible carbon fiber that is utilized in future flexible wearable device and flexible lithium-ion battery electrode material. ADVANTAGE - The method enables producing the flexible carbon fiber with strong binding force and high flexibility, conductivity and capacity lithium-storing active material. DETAILED DESCRIPTION - A flexible carbon fiber producing method involves obtaining and immersing pure cotton thread in aqueous solution-containing ethanol for 1-24 hours. Impurities are removed and dried at 60-100 degrees C for 5-24 hours. Carbon nanotubes and/or graphene are dispersed in a solvent to obtain slurry with various concentration. The pure cotton thread is impregnated with the slurry and dried to obtain fiber precursor. The fiber precursor is heat-processed under inert atmosphere, where graphene is supported on fine fiber surface of cotton thread and protected under inert atmosphere, main cellulose of pure cotton thread is carbonized and combined with graphene and carbon nanotunes tightly.