▎ 摘　　要

NOVELTY - A graphene composite fiber comprises a graphene inner core layer and a molecular protection layer. The graphene inner core layer is formed by arranging graphene in an axial direction. A distance between the graphene inner core layers is 0.3-0.4 nm. Potassium ions are doped between the graphene layers. The molecular protection layer comprises halogenated hydrocarbon molecules covalently combined with graphene in a surface layer of the graphene inner core layer. USE - Graphene composite fiber is useful as a wire for light electric motors, flexible wearable devices and electromagnetic protective clothing. ADVANTAGE - The graphene composite fiber is environmentally-friendly and simple to prepare, and has excellent mechanical properties and high electrical conductivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the method for preparing the graphene composite fiber.