Preparation method of negative current collector and super capacitor using same

The invention provides a preparation method of a negative current collector. The method is characterized by including (1) placing the negative current collector into a high-temperature acid solution for a period of impregnation; (2) washing the surface acid solution and drying; (3) coating a metallic oxide layer and drying; and (4) coating a carbon material layer and drying. The invention further provides a super capacitor using the negative current collector prepared through the method. The super capacitor is composed of a positive plate, a negative plate, a diaphragm and an acidic electrolyte, and is characterized in that active materials of the positive plate is composed of lead oxide, and the active materials of the negative plate adopt porous carbon materials. The super capacitor is high in energy density (18-25Wh/Kg), long in cycle life (15,000 times) and capable of being applied to occasions requiring for high energy and long service life.