Preparation And Capacitive Properties Of Flexible Electrodes Based On Polypyrrole

With the advent of wearable electronic devices,wearable and flexible energy storage devices are also receiving increasing attention from researchers.Electrode materials are a key part of supercapacitors.At present,research on electrode materials is mainly focused on improving the performance of electrode materials.The yarn electrode has a simple structure and can be integrated into the fabric by weaving or knitting,which is applied to a wearable textile.In recent years,the development of novel flexible electrode materials and improved electrode material synthesis technology has become a research hotspot.In this paper,flexible highly performance electrodes are prepared based on textile materials and polypyrrole materials.The PAN nanofibers is prepared by the solution blowing spinning technique,Preparation of PAN/Cotton core yarn.Exploring the synthesis process of polypyrrole materials.Prepare the yarn electrode and assemble the supercapacitor to explore and analyze the performance of the electrode and device.The main research contents and conclusions are as follows:(1)PAN/PPy core-spun yarn was prepared by solution spinning technique using cotton yarn as the core yarn.The specific surface area of ordinary cotton yarn is 2.277m² g^-1,and the specific surface area of PAN/Cotton core yarn is 2.794 m² g^-1,and the specific surface area is increased by 22.7%.The PAN/Cotton core-spun yarn surface has a network structure that provides more channels for electrolyte penetration and ion transfer.An increase in specific surface area can provide more active sites for the active material.(2)In-situ polymerization of polypyrrole by changing the concentration of pyrrole monomer and polymerization time.When the concentration of pyrrole is 0.4 M/L and the reaction time is 120 min,the loading of PPy/PAN/Cotton electrode tends to be stable(0.51 mg/cm).the resistivity is the smallest(26.84?/cm).The specific surface area is3.367 m² g^-1.And the specific capacitance is as high as 742.79 m F cm^-2(81.74 F cm^-3).The assembled supercapacitor has a large specific capacitance of 341.67 m F cm^-2(37.60F cm^-3).the higher energy and power densities are 0.047 m Wh cm^-2 and 4.32 m W cm^-2,respectively.and good cycle stability(2000^th,81.91%).good mechanical stability,specific capacitance is almost no change at different bending angles.(3)The hydrothermal method is applied to the PPy/PAN/Cotton electrode to further improve the cycle stability and specific capacitance of the electrode.When the reaction time is 2h,the specific capacitance of the electrode material is 400 m F cm^-2(44.02 F cm^-3),and the specific capacitance is increased by 14.58%.Excellent cycle stability(2000^th,99.11%),the growth rate is 17.35%.and the cycle retention rate is maintained at 90.28%when the number of cycles reaches 5000.The doped manganese dioxide material not only improves the specific capacitance of the electrode material,but also effectively improves the cycle stability of the electrode material.