| Asymmetric supercapacitor, called as hybrid supercapacitor. One of the electrodes of it is double layer on electrode, and the other is Faraday quasi capacitance electrode. Because of it is combined with the mechanism of two kinds of storage capacitor, and it also has the advantages of high specific energy, high specific power and cycle performance is excellent, with no pollution and so on, it has a very high application value. The asymmetric supercapacitor in the field of new energy storage battery, mobile electronic equipment, military equipment, vehicles, large missile field operations and space flight are all have broad application prospects with these excellent characteristics. The electrode materials is the key factor for the super capacitor to determine the performance. It is a hot research topic of the asymmetric supercapacitor. Currently, the carbon material, metal oxide and conducting polymer are all the key research materials for asymmetric supercapacitor.Due to its large surface area,mechanical properties, excellent thermal conductivity and electrical conductivity,graphene has a very large potential applications in electronic devices utensils, battery capacitors, biomaterials and mechanical enhancements, and many other fields. In this paper,graphite oxide was prepared using modified Hummer’s method, composite with Li FePO4, MnO2 and Fe2O3 respectively, as the cathode materials. The graphene individual as cathode material to composed of an asymmetric supercapacitor. The preparation of lithium iron phosphate/graphene|| graphene asymmetric supercapacitor window work voltage is 3V, when the energy density is 42.8Wh/kg, the power density is 1284W/kg; Manganese dioxide/graphene||graphene asymmetric supercapacitor window work voltage is 1.4V, when the energy density is 23.59Wh/kg, the power density is 7018W/kg; Ferric oxide/graphene||graphene asymmetric supercapacitor window work voltage is 1V voltage, the energy density of 11.8Wh/kg, the power density of 786.43W/kg. |
PDF Full Text Request