| Energy shortage and environmental pollution problems have forced States to look at sustainable development in new energy and advanced energy storage technology. China new energy, new material and new energy vehicles,classified as a national strategic industry, and material progress and promoting the development of other industries. As the two commonly used energy storage devices, conventional capacitors have very high power density, but it has very low energy density. Meanwhile, restrictions on life in the battery makes it inefficient to use. Super capacitor energy storage device as a high performance, due to its extensive application of information technology,hybrid electric vehicles, has attracted significant attention.Super capacitor as a kind of electrochemical energy storage and conversion equipment, its power density, charge/Discharge rate, the cycle life has many advantages, such as, which is used widely in the field of energy,such as portable electronic devices, electric vehicles and Smart grids. Compared with the lithium-ion battery, relatively small energy density supercapacitors a fatal defect. Than the expansion of super system capacitance can improve the energy density of the system, as well as operating voltage.Electrodes and the electrolyte supercapacitor plays a key role in the system. Polyaniline has the theoretical capacity and environmental advantages of high stability, high power density, is a focus of energy storage field researchers study. But some inherent disadvantages, such as conductive properties of polyaniline late and poor machinability limits its application to life. Therefore, additional materials and conductive polyaniline composites to improve material performance and workability as a means commonly used by researchers. Because of its high electrical conductivity of carbon nanotubes, as well as special structures and composites in this article is as a substrate with polyaniline compound, got good performance can be applied to the composite electrode materials for supercapacitors, meanwhile also found another way to improve the electrochemical properties of the composite (introduced to restore electrolytes) and conducted an in-depth inquiry. Main content as follows:(1) Choose the aspect ratio in the 10?15 Multi-walled carbon nanotubes,after acid active carboxylic acid groups on the surface is processed with aniline compound is obtained with three-dimension network structure of multi-walled carbon nanotubes/Polyaniline composite polyaniline uniform radial wrapped in carbon nano-tube external wall at the same time, lapping the criss-cross of carbon nanotubes together, forming a good electrical properties of network structure. These features enable the multi-walled carbon nanotube/polyaniline composites with good electrochemical performance,capacitance values in the sulfuric acid solution at l A/g conditions can reach 150 F/g?(2) In the synthesis of multi-walled carbon nanotubes/Polyaniline composites on the base. Redox electrolyte of potassium iodide electrolyte by innovatively introduced into system, to enhance the electrochemical performance of Super System. Until now, no one else would suituric acid/potassium iodide solution as a multi-walled carbon nanotube/polyaniline composite electrode materials of the electrolyte. Meanwhile, the experiment also continues to explore the composite under different potassium iodide electrolyte concentration (1, 0.5, 0.2, 0.1, 0.05 mol/L) than the capacitance value, find potassium iodide in the concentration range for the most effective concentrations than the capacitance in 0.05 mol/ L , 0.1 A/g Cases can be achieved 4960 F/g?(3) In exploring multi-walled carbon nanotubes/Polyaniline composite electrode material in the introduction of redox electrolyte of potassium iodide after the electrochemical performance of the system. We continue to explore the composites of other redox electrolyte electrochemical properties on hydroquinone/achieved gratifying results in mixing sulfuric acid electrolyte,under the condition of three-electrode capacitance values in 2 mol/L, and 0.2 A/g Cases can be achieved 7926 F/g Two electrodes under the condition of energy density in 2 mol/L, 1 A/g Cases can be achieved 114 Wh/kg ?... |
PDF Full Text Request