▎ 摘　　要

NOVELTY - Producing coiled graphene/carbon nanotube composite fiber, comprises (a) immersing carbon nanotube sheet in graphene solution, (b) twisting the carbon nanotube sheet to prepare carbon nanotube yarn containing graphene solution, (c) removing solvent of the graphene solution by drying the carbon nanotube yarn, and (d) twisting solvent-free yarn to obtain coiled graphene/carbon nanotube composite fibers. USE - The composite fiber is useful in electrochemical artificial muscle (claimed). ADVANTAGE - The fiber provides artificial muscle having high capacitance by setting optimal content of graphene and good tensile shrinkage. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) coiled graphene/carbon nanotube composite fiber produced by the above method; and (2) electrochemical artificial muscle comprising the coiled graphene/carbon nanotube composite fiber and an electrolyte, which is driven by application of a voltage.