The Research Of Supercapacitor Electrode Materials And Flexible Devices

With the growing consumption of oil and the rising environmental pollution caused by automobile exhaust, the electric vehicles and hybrid electric vehicles obtained fast development. The environmentally friendly and high-performance energy-storage systems is very important for electric vehicles. Supercapacitors, also known as electrochemical capacitors(ECs) or ultracapacitors, have attracted much attention in the automotive and consumer electronics industry due to their high capacitance, long cyclic life, low maintenance cost and fast dynamics of charge propagation.Increasing demand for portable electronics devices, minia-turized wireless sensor networks and feasibility of applying micro-electronic devices to wearable devices or biological implants, there has been an ever increasing demand for scalable, flexible electronic devices to replace the traditional rigid electronic devices. It is also one of the important factors to implement these possibility that how to solve the problem of the flexible electronic equipment of energy storage. Micro-supercapacitors, could enable the entire device to be much thinner and flexible.To further enhance the properties of supercapacitors, the electrode materials for supercapacitors and the devices of flexible supercapacitor were studied as follows:(1) The graphene/b-PEDOT/MWCNTs nanocomposite was designed and prepared by reducing the graphene oxide with hydrazine in the presence of multiwalled carbon nanotubes(MWCNTs) and the anchored poly(ethylenedioxythiophene) hollow spheres(b-PEDOT). The morphology and electrochemical measurements have shown that graphene/b-PEDOT/MWCNTs nanocomposite can be a promising candidate material for supercapacitors applications. And a specific capacitance of 225 F g-1 at a current density of 0.1 A g-1 is achieved.(2) A novel supercapacitors electrode material named MnO2/b-PEDOT/MWCNTs was designed and prepared. The morphology and electrochemical measurements have shown that MnO2/b-PEDOT/MWCNTs nanocomposite can be a promising candidate material for supercapacitors applications. And a specific capacitance of 270 F g-1 at a current density of 0.3 A g-1 is achieved.(3) In this paper, a new flexible, low cost and easy fabricated micro-supercapacitors device by using MnO2/b-PEDOT/MWCNTs nanocomposite as electrode material is assemblied. Such method is suitable for various powder electrode materials. And a specific capacitance of 110 F g-1 of this micro-supercapacitors device at a current density of 2 A g-1 is achieved.