Research Of Direct Ink Writing In Micro-supercapacitor

Micro-supercapacitor is an emerging electrochemical energy storage device with great advantages in power density,cycling performance and charging rate owing to the interdigitated integrated electrode structure.However,the current micro-machining methods still have some problems in variable substrates,all printing,material saving,stereoscopic structure and expansibility.Direct ink writing is a kind of 3D printing technology which made a breakthrough in manufacturing biological organs,software robots,sensors and so on.This paper aims to address the processing problems of micro-supercapacitors via direct ink writing.Firstly,conductive polymer and graphene materials were used as electrodes,and PVA gel was used as electrolyte to realize a 3D all printed micro-supercapacitors on different substrates.By electrochemical analysis,this printed device has good electrochemical properties:the highest specific capacity can reach 151.2 mF cm^-2.Secondly,based on this variable substrate printing technology,two in situ fabricated devices were designed and formed.One is a tape type micro-supercapacitors which can be easily transferred to any surface.The other is an in situ fabricated supercapacitor which was printed directly on common clothing with good flexibility.In addition,a preliminary exploration of the all printing of the integrated device was made,and a duplex printing of integrated device on paper was produced.The integrated device consists of an asymmetric micro-supercapacitor and a linear temperature sensor.Asymmetric micro-supercapacitors exhibit an energy density of up to 8.37?Wh cm^-2,which can provide a stable energy supply for sensors or other devices.The linear temperature sensor is printed on the other side of the paper with a high temperature sensitivity of 2.83%/?.