Preparation And Properties Of Large-capacity Capacitor,

Supercapacitor, a novel energy storage component between battery and electrostatic capacitor. It integrates the advantages, such as the high power density characterized by conventional electrostatic capacitor, the energy density characterized by battery, the fast charge-discharge performance, no pollution and the long life, thus the component is expected to be a novel green power source.In this thesis, a series of experiments were conducted based on active carbon as electrode material. The main factors affecting the properties such as the adhesive, the weight of electrode, discharge current density, electrolyte concentration, separator type and conductive agent type were carefully reviewed. Specific capacitance of 186.7F/g at 10mA current in a single sell was achieved.Polyimide was synthesized, with pyrolytic of polyimide as electrode material, constant current charge-discharge tests were studied. Specific capacitance of 37F/g was obtained.A hybrid supercapacitor was fabricated using a Ni(OH)2 positive electrode and a active carbon negative electrode, Ni(OH)2 prepared by chemical precipitation method. The electrochemical properties of electrode and the capacitive behavior of the resulting supercapacitor were studied by cyclic voltammetry and constant current charge-discharge tests. The results show that the hybrid supercapacitor has good charge-discharge and cyclingperformances. The maximum operational voltage of the capacitor can be improved effectively. The Maximum specific capacitance of 450F/g was obtained in 6mol/L KOH electrolyte.