▎ 摘　　要

NOVELTY - Preparing graphene modified polyacrylonitrile fiber (F1) involves: a) dispersing oxidized graphite alkene in N,N-dimethylformamide (DMF) to form brown-yellow layer of saturated solution of oxidized graphite alkene; b) dissolving polyacrylonitrile polymer in DMF to form polymer solution; c) mixing solution formed in a) and polymer solution formed in b) to form precursor solution; d) subjecting the precursor solution to electrostatic spinning or melt spinning method to form (F1); e) drying; and f) then carbonizing it under the protection of inert gas atmosphere or vacuum condition. USE - For preparation of graphene modified polyacrylonitrile fiber (claimed) which is used for lithium ion battery, electrochemical capacitor and in the military and aerospace field. ADVANTAGE - The graphene modified polyacrylonitrile fiber obtained by the present method has great market application prospect and commercial value. The lithium ion secondary battery obtained by using present graphene modified polyacrylonitrile fiber provides high efficiency; is safe and environment-friendly; provides high electronic conductivity; and provides improved the circulating performance. DETAILED DESCRIPTION - Preparation of graphene modified polyacrylonitrile fiber involves: a) dispersing oxidized graphite alkene in N,N-dimethylformamide (DMF), aging to obtain brown-yellow layer of saturated solution of oxidized graphite alkene; b) dissolving polyacrylonitrile polymer in DMF to obtain transparent polymer solution, where the concentration of polymer solution 6-12%; c) mixing the saturated solution obtained in step a) and polymer solution obtained in step b) to obtain precursor solution, where the volume ratio of saturated solution and polymer solution is 1:1-10; d) subjecting the precursor solution to electrostatic spinning method or melt spinning method to obtain the graphene modified of polyacrylonitrile fiber; e) drying the obtained the graphene modified of polyacrylonitrile fiber at 230-330 degrees C, where the heating speed is 0.10-10 degrees C/minute; and f) then carbonizing it under the protection of inert gas atmosphere or vacuum condition at 1100-2800 degrees C, where the heating speed is 3-10 degrees C/minute.