| As the demand for flexible display and wearable display electronic devices continues to increase,the demand for flexible energy storage devices is also growing rapidly.Supercapacitors with small size,high performance and safety have become a hot spot in the research of energy storage devices.Graphene,as the main electrode material of supercapacitors,has also received extensive attention.Although,in recent years,there have been many micromachining technologies for the design and preparation of supercapacitors,and good progress has been made,but there are still shortcomings such as complex preparation processes,unstable substrates of flexible supercapacitors,or low specific capacitance.To meet the application in the actual environment.In this context,this paper has developed a laser-induced graphene electrode method for simple preparation of integrable flexible supercapacitors that can achieve rapid charge and discharge,high bending performance,and high specific capacitance.The main contents are as follows:(1)Using polyimide precursor solution as raw material,use an applicator to uniformly coat the polyimide precursor solution on the required substrate(such as cloth,paper,etc.),and use a blast oven to The polyimide precursor solution is dried to obtain the film,and then the electrode shape is drawn,the graphene electrode is made by laser inducing the polyimide film,and then the electrolyte is coated to lead the electrode,and finally the package can be obtained based on laser induction.Flexible supercapacitors with graphene electrodes.Its electrochemical characteristics show that the graphene flexible supercapacitor has a high area specific capacitance of 2.4m F/cm~2,has good flexibility in the bending state,and has almost no capacitance loss,as well as excellent series characteristics.(2)Pseudocapacitance materials and carbon-based materials are added through graphene electrodes,and the high specific capacity is used to further increase the area specific capacitance of the prepared supercapacitor.Using the doping method of adding cobalt chloride hexahydrate to the polyimide precursor solution,and using the conditions of high temperature air during the laser-induced graphene process,an electrode composed of the pseudocapacitance material tricobalt tetroxide in the graphene electrode was prepared.,And then add the electrolyte package to obtain the graphene composite electrode flexible supercapacitor.By measuring its electrochemical characteristics,the graphene composite electrode flexible supercapacitor achieves a high area specific capacitance of 10.9m F/cm2,and has excellent cycle stability.At a scanning frequency of0.08m A/cm2,the retention rate of capacitance after 10,000 cycles is still 97.8%.The graphene composite electrode flexible supercapacitor has almost no capacitance loss under multiple bending conditions.It has excellent flexibility and mechanical stability on the surface,and can easily drive electronic watches and LED lights in series and parallel tests.The laser-induced graphene electrode designed in this paper can prepare flexible planar supercapacitors with high specific capacitance,excellent stability and ultra-long cycle life on a variety of substrates,which can well meet the storage requirements of various wearable electronic devices in the future.Can demand.In addition,the laser-induced graphene electrode preparation method for flexible supercapacitors prepared in this paper has the characteristics of low preparation cost and good integration,which provides research ideas for large-scale preparation of flexible supercapacitors of different carbon-based materials. |
