▎ 摘　　要

NOVELTY - Method for preparing high elongation graphene fibers involves (1) extruding a spinning solution of graphene oxide into a coagulating bath to obtain primary graphene oxide fibers, (2) continuously pulling the primary oxide graphene fiber into a stretching bath, so that the interlayer spacing of the graphene oxide reaches 1.1-1.8 nm and stretching the fibers, where the stretching bath is ethanol, acetone, isopropanol, acetic acid, ethyl acetate, methanol, water, glycerol, propylene glycol, ethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol, hydrochloric acid, organic amine or their mixed solvent, (3) drawing 1.3 times the stretched fiber into a new coagulating bath, adjusting the speed ratio of the front and rear wire winding machine, so that the stretching multiple is less than 1, and realizing 'negative stretching' and (4) subjecting the graphene oxide fibers after 'negative stretching' to heat setting and performing chemical reduction and heat treatment. USE - The method is useful for preparing high elongation graphene fibers. ADVANTAGE - The method adopts simple and controllable process and prepares graphene fibers with regular wrinkles and high elongation at break. DETAILED DESCRIPTION - Method for preparing high elongation graphene fibers involves (1) extruding a spinning solution of graphene oxide into a coagulating bath to obtain primary graphene oxide fibers, (2) continuously pulling the primary oxide graphene fiber into a stretching bath, so that the interlayer spacing of the graphene oxide reaches 1.1-1.8 nm and stretching the fibers, where the stretch rate is 30% and the stretching time is maintained for 3-5 seconds, where the stretching bath is ethanol, acetone, isopropanol, acetic acid, ethyl acetate, methanol, water, glycerol, propylene glycol, ethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol, hydrochloric acid, organic amine or their mixed solvent, (3) drawing 1.3 times the stretched fiber into a new coagulating bath, adjusting the speed ratio of the front and rear wire winding machine, so that the stretching multiple is less than 1, and realizing 'negative stretching' and (4) subjecting the graphene oxide fibers after 'negative stretching' to heat setting and performing chemical reduction and heat treatment.