石墨烯基不對稱超級電容器的研究
[Abstract]:Asymmetrical supercapacitors are often referred to as hybrid supercapacitors. The name of these supercapacitors is the structure of which two electrodes are composed of different materials. Because it combines the two kinds of storage capacitance fully, it has the advantages of high specific energy, high specific power, good cycle performance, no pollution and so on. It has high practical application value and can be used in new energy storage battery. Mobile electronic equipment, large-scale missile military equipment, vehicles, field operations, space flying objects and other fields. The selection of electrode materials is one of the most important factors affecting the performance of supercapacitors, which is the research hotspot of asymmetric supercapacitors. At present, the commonly used electrode materials are carbon materials, metal oxides and conductive polymers. Because of its large specific surface area, strong mechanical properties, excellent thermal conductivity and conductive properties, graphene has great application prospects in many fields, such as electronic devices, battery capacitors, biomaterials and mechanical enhancement. Especially the large specific surface area and excellent electrical conductivity of graphene make it have a good application prospect in the research and preparation of supercapacitors. In this paper, graphene (prepared by improved Hummers method) was used as the matrix. The composite of them with olivine LiFePO4 prepared by coprecipitation method, amorphous MnO _ 2 prepared by microwave reaction and Fe _ S _ 2O _ 3 prepared by hydrothermal method is composed of cathode material and graphene negative electrode material. The working window voltage of the prepared lithium iron phosphate / graphene asymmetric supercapacitor is 3V, and the energy density is 42.8 Wh.kg. The power density is 1284 W / kg; the working window voltage of the manganese dioxide / graphene asymmetric supercapacitor is 1.4 V, and its energy density is 23.59 Wh-1 / kg. Its power density is 7018W / kg, and the working window voltage is 1V and the energy density is 11.8Wh/ kg, and the power density is 786.43W / kg.
【學位授予單位】:武漢工程大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TQ127.11;TM53
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