Patent ID: 7974073
Filing Date: 2011-07-05
Classification: H01G,Y02E

Abstract:
1. An electric double-layer capacitor comprising: a positive electrode containing a carbon material; a negative electrode containing a carbon material, a conductive additive, and a fine particle titanium dioxide; the conductive additive being a material other than the fine particle titanium dioxide, the fine particle titanium dioxide including titanium dioxide crystals of an anatase form; and an electrolytic solution containing an ammonium salt as an electrolyte salt and does not include Lithium ions, wherein a weight ratio of the conductive additive to the carbon material contained in the negative electrode is 1% by weight or more but not more than 20% by weight, with an average particle diameter of less than 0.5 μm, a weight ratio of the fine particle titanium dioxide to the carbon material contained in the negative electrode is 2% by weight or more but not more than 50% by weight, with a specific surface area of 10 m said electric double-layer capacitor is driven at 3.0 V or more, and wherein the positive electrode and the negative electrode are impregnated with the electrolytic solution, the electric double-layer capacitor is charged by applying a voltage of 3.2 V between the positive electrode and the negative electrode for 30 minutes so as to remove impurity, and the positive electrode and the negative electrode are packed in a packaging after applying the voltage.