▎ 摘　　要

Highly flexible all-solid-state cable-type supercapacitors based on Cu/reduced graphene oxide/manganese dioxide fibers (Cu/RGO/MnO2) were successfully assembled by closely placing two Cu/RGO/MnO2 fibers in a parallel direction and using PVA-KOH gel electrolyte, in which the Cu/RGO/MnO2 fiber electrode, possessing good flexibility, excellent electrochemical properties, and high electrical conductivity was prepared by heating a glass pipeline filled with a Cu wire and a graphene oxide homogenous suspension at 230 degrees C for 2.5 h. The Cu/reduced graphene fiber was then refluxed in KMnO4 solution at 70 degrees C for 120 min. As well as being used as a current collector, the Cu wire also served as the matrix for depositing active materials and improving the fiber flexibility, causing a highquality interfacial contact between the current collector and the active materials. The optimized allsolid- state Cu/RGO/MnO2 ((6.0)) fiber supercapacitor showed a high specific capacitance of 140 mF cm(-2) at a current density of 0.1 mA cm(-2), enhanced capacitance retention of 97% after 500 bending cycles with a big angle of 120 degrees, and relatively good stability (88% of initial capacitance values after 5000 cycles). Moreover, aside from its excellent electrochemical performance, it could light a LED lamp when connected with a battery, indicating that the assembled Cu/RGO/MnO2 fiber supercapacitor could be used not only as an energy storage device, but also an electrical conduction cable, which could have a significant impact on future energy storage applications.