Construction Of Flexible Wearable Supercapacitor Based On Nanofiber Spinning Technology

With the rapid development of wearable electronic products,the development of light,flexible,low-cost and efficient energy storage devices has attracted more and more attention.Among energy storage devices such as lithium batteries,solar cells and supercapacitors,supercapacitors have attracted extensive research due to their advantages such as rapid charge and discharge,ultra-high power density,long cycle life and high specific capacitance,etc.,and have become a potential energy source.Based on electrospun nanofiber technology,a fiber type flexible supercapacitor with high performance is constructed in this paper.The main contents of this paper are as follows:?1?The spinning liquid was prepared with cobalt acetate and polyacrylonitrile at a certain mass ratio.Carbon fiber was used as core yarn by electrostatic spinning technology,and a layer of PAN/CO?CH3COO?2 nanofiber was uniformly coated on the surface of carbon fiber.The nanofiber core-spun composite was constructed.The nanofiber core-spun composite was immersed in dimethylimidazole alcohol solution to obtain ZIF-67 metal Organic framework.Using the synergetic effect of ZIF-67 and large specific surface area of nanofibers,a larger space was provided for the subsequent orderly in-situ polymerization of polypyrrole on the surface of nanofiber core-spun yarn,and fibrous PPy/ZIF-67/PAN electrode materials were obtained.Using PVA/H2SO4 gel electrolyte as the medium,the two electrode materials were assembled into PZP/NCY supercapacitor.At 5 mV s^-1,the area specific capacitance value can be displayed as high as 17.84 mF cm^-2.?2?The conductive cotton yarn was constructed by electroless nickel plating on the surface of cotton fiber,and then the four needle electrospun core-spun yarn was used to co spray polyacrylonitrile/graphene oxide?GO-doped PAN?on the surface of conductive cotton yarn solution and graphene oxide solution were used to construct the nanofiber core spun cotton composite,and then a conductive polypyrrole was polymerized on the surface of the nanofiber core spun cotton composite to produce fiber like PPy/GO-doped PAN/GO electrode material is coated with gel electrolytes on two electrode materials,and further assembled by torsion to form PGPG/NCY type fiber supercapacitors.The area capacitance of the supercapacitor is17.12 mF cm^-2 at 5 mV s^-1,and the area energy density and power density of the 0.2 mA cm^-2current density are 3.98?Wh cm^-2 and 0.146 mW cm^-2 respectively.After 1000th cycles,the specific capacitance loss is only 9.8%,and the cycle performance is stable.Furthermore,the PGPG/NCY fiber supercapacitor is woven into the ordinary fabric by the small sample loom,and the capacitance value is basically unchanged.This indicates that the electrospinning core-spun yarn technology can be used to prepare supercapacitors with excellent electrochemical performance,durability and flexibility,which can be used as energy storage devices in intelligent wearable devices and have a high application prospect.