Printable Flexible Electrochemical Energy Storage Device And Its Performance

As an emerging energy storage device,supercapacitors have the advantages of capacitors and batteries,and show perfect application prospects in the fields of rapid charge and discharge,power density,and flexible wearable.Compared with traditional laboratory preparation methods?such as spin coating,inkjet printing,etc.?,screen printing technology has attracted much attention due to its advantages of low cost,large area,patterning,and flexibility compatibility.This work focuses on the research of screen printing preparation,experimental process improvement,and device performance control of flexible supercapacitors?1?Using flexible Polyethylene Terephthalate?PET?as the substrate,screen printing Ag NWs grid was made as a current collector for supercapacitors,and coating PEDOT:PSS on the grid structure as an energy storage material.In this way,effectively preventing Ag NWs from being oxidized and improve electrical conductivity.On this basis,a sandwich-structured all-solid flexible supercapacitor with an area specific capacitance of 8.58 m F cm^-2 was prepared.Compared with using of PEDOT:PSS electrode material alone(area specific capacitance is only 3.9 m F cm^-2),the performance is significantly improved.At the same time,the supercapacitor exhibits good flexibility and bending resistance,and achieves ingenious pattern preparation.?2?On the wearable fabric substrate,the PEDOT:PSS interdigitated electrode structure was prepared by screen printing,and Mn O₂ was further electrochemically deposited on this structure to obtain an interdigitated capacitor based on the PEDOT:PSS/Mn O₂electrode.By adjusting the mesh number of the printing screen and the electrochemical deposition conditions,the optimization of the electrochemical performance is achieved.The mass specific capacitance can reach 15.91 F g^-1 and the volume specific capacitance reaches 4.14 F cm^-3.The experiment proves that using the fabric as the base can fully utilize the thickness and pores of the fabric itself to increase the load of the energy storage material and facilitate the transport of charge.?3?The three-dimensional PDI-CMP and PEDOT:PSS ink are combined to produce PEDOT:PSS@PDI-CMP electrode,and the Ag electrode obtained by screen printing also constructs Ag//PEDOT:PSS@PDI-CMP asymmetric sandwich structure Super capacitor.Compared with two-dimensional materials,conjugated porous polymers have a larger specific surface area and active sites,which can increase the contact between the charge and the electrode,and achieve good electrochemical performance.The area specific capacitance is 1.35 F g^-1.In addition,compared with the three-electrode test system commonly used in other reports,the preparation of the supercapacitor device is simple and more practical.