| With the arrival of the 5G era,the demand for various portable intelligent wearable electronic products is growing.The driving energy device of wearable electronic products needs to withstand certain deformation.How to achieve long-term stable energy storage under the deformation condition is still a huge challenge.It is well known that current electrochemical energy storage systems,including batteries and supercapacitors（SCs）,are one of the most widely used new storage devices in a variety of energy storage systems.Among them,supercapacitors have high power density,good cycling,can store and release energy in a few seconds,and have higher reliability and better security.However,solid-state flexible supercapacitors,which have attracted much attention,still have the following bottlenecks.Some substrates used for fluid collection（such as carbon cloth）,although with a certain degree of flexibility,but the transparency and tensile properties still cannot meet the needs of devices.In this paper,thermoplastic polyurethane（TPU）was blended with tannic acid（TA）,and the flexible transparent stretchable substrate used in fluid collecting devices was prepared successfully.On this basis,the TPU/TA film substrate was prepared by electrospinning technology.At the same time,the resistance,mechanical properties,optical transparency and electrochemical properties of the substrate used in supercapacitors were studied.The details are as follows:1.In the first part of the work,the thermoplastic polyurethane/tannic acid（TPU/TA）transparent film was designed and prepared,and the substrate film with excellent performance was prepared by adjusting the thickness of the film,the proportion and concentration of the precursor solution.The results show that when the thickness of the film is 18μm,the concentration of TPU solution is 3.6%,and the mass ratio of TPU to TA is 100:1,the transmittivity of the film reaches 81%（at 550nm）.On this basis,the stress and strain test is carried out.The results show that the film can reach 500%stretch under the condition of optimal transmittance,and the strain is significantly higher than that of pure TPU film after adding TA,and the transmittance of the film does not decrease significantly before and after stretching under this condition.The film is hydrophobic,which can effectively avoid the influence of water vapor in the air.2.On the basis of the work in the first part,the gold conductive layer with a thickness of 100 nm was steamed on the above film by a evaporation instrument,and the resistance of the film was 5Ω.It is found that the transparency of the film has a certain attenuation,but it still has relatively good flexibility.Using the plated film as the base and TA-PAA-Fe3+/KCl as the gel electrolyte,activated carbon based supercapacitors are prepared.When the current density is 1 m A cm-2,the maximum capacitance can reach 109.8 m F cm-2,which has good electrochemical performance.In order to further explore the superiority of superelectric properties,using the gilded film as the base and PAA-VSPNs-Co2+/KCl as the gel,the area specific capacitance can reach 138.6 m F cm-2 when the current density is 1 m A cm-2.Compared with the supercapacitors(area specific capacitance is 104.1 m F cm-2)prepared with carbon cloth as the collecting system under the same conditions,the above results show better electrochemical performance.3.In the third part,the thermoplastic polyurethane/tannic acid（TPU/TA）fiber film was prepared by the technology of electrostatic spinning.The diameter of the thermoplastic polyurethane fiber film was about 660 nm.After adding TA,the diameter of the fiber was significantly reduced to about 550nm.When the current density is 0.09 m A cm-2,the area specific capacitance is 0.98 m F cm-2,which indicates that the polymer fiber wiper fluid collector has certain feasibility and potential application prospect in the future suitable application scenarios. |
