ELECTRIC DOUBLE LAYER CAPACITOR AND ITS MANUFACTURING METHOD

摘要

PURPOSE: An electric double layer capacitor and its manufacturing method are provided to decrease the internal resistance and to improve the physical characteristics of the electrode by doubling the layer by using the two binders. CONSTITUTION: The electric double layer capacitor comprises electrode active material having active carbon(21,22) and conductive binder(24), mixed binder(26) for binding the electrode active material, and an electrode where the bound electrode active material is coated. The mixed binder is polytetrafluoroethylene and the water-soluble binder is cellulose or polysaccharide. The first group of the active carbon has an average diameter of about 50 - 80 μm and the specific surface area of about 1500 - 300 m¬2/g and the bulk density of about 0.25 - 0.35 g/ml. The second group of the active carbon has an average diameter of about 7 - 13 μm and the specific surface area of about 1500 - 300 m¬2/g and the bulk density of about 0.3 - 0.4 g/ml.