Wearable Application And Construction Of Yarn-Shaped All-Solid Supercapacitor Based On Conducting Polymer

The rapid development of intelligent wearable technology has promoted the progress of flexible sensing device and energy storage device.Flexible and lightweight textile substrate has become an important choice for the preparation of sensing electrode and energy storage electrode.Among all kinds of flexible textile substrates,yarn has become a new electrode substrate with development potential because of its good stretchability,weavable design,reusability and hydrophilicity.However,in the selection of flexible substrates and electrochemically active substances,there are often problems such as unstable deposition of substrate surface active substances,complicated preparation methods and unstable electrochemical properties.Therefore,in this paper,different flexible electrodes are designed to select the electrodes with better performance to assemble the yarn-shaped flexible supercapacitors and apply them to the textile wearable field.The main research contents are as follows:(1)In order to solve the problem that electrochemically active substances can be deposited on the surface of yarn more tightly and firmly,stainless steel yarn and stainless steel blended yarn were selected as the substrates for the preparation of flexible electrodes in this paper.Electrochemical deposition method with different time gradients was used to deposit the active material polyaniline on the surface of yarn to obtain electrodes.The experimental results show that the hydrophilic structure of cellulose in the stainless steel blended yarn makes the surface of the yarn deposited polyaniline more firmly and has better cycling stability.The double-layer effect was obtained by spraying graphene on the stainless steel blended yarn,and then the electrodes were prepared by electrodeposition of polyaniline.The flexible supercapacitor was assembled and its electrochemical performance was tested.The yarn-shaped flexible supercapacitor was assembled with an area specific capacitance of782.8 m F/cm~2.After 8000 cycles,the cycling stability was good and the capacitance value remained 76%,providing an effective way for the preparation of high-performance wearable flexible supercapacitor.(2)Using conductive polymer polythiophene as electrochemically active substances,polythiophene electrodes were prepared by in-situ polymerization and then doped with sorbitol to obtain flexible electrodes.The results show that the electrodes prepared by in-situ polymerization have better electrochemical performance.At the scanning rate of 100 m V/s,the area specific capacitance of the polythiophene doped blended yarn electrode can reach128 m F/cm~2.The yarn-shaped flexible supercapacitor was assembled with the electrode and its electrochemical performance was tested.The experiments show that the yarn-shaped supercapacitor has a good charge storage capacity,and the super area energy density is 10.3?Wh/cm~2at the power density of 0.17 m W/cm~2.Demonstrates the potential of such textile systems in electronic textiles and other wearable electronics.(3)In order to realize the application of wearable devices,composite electrodes deposited by in-situ polymerization of polythiophene are used to manufacture telescopic sensors and flexible supercapacitors.First,the experimental results showed that several yarn-like flexible supercapacitors in series can successfully light up a heart-shaped LED bulb,and a scene was designed to record the brightness of the bulb.The strain sensor and the yarn-like supercapacitor are woven in a woven way as the sensing element and power supply.The textile system,woven using traditional textile methods,combines self-sensing,self-powered"all-in-one"functionality,while still maintaining a level of wearable performance.The self-powered textile system with self-sensing characteristics may become the development direction of intelligent wearable devices in the future.To sum up,through the screening of yarn of stainless steel base material and polyaniline and polythiophene electrochemical surface active substance deposition yarn,and finally got excellent electrochemical properties of electrodes,assemble the yarn shape flexible super capacitor,and intelligent wearable device performance test and application,showed the energy storage characteristics of excellent and good cycle stability.It provides ideas for energy storage devices of wearable devices in the future.