| 摘要 |
PURPOSE:To stabilize self-discharge characteristic of an electric double layer capacitor by a method wherein this capacitor is composed of powdery activated carbon whose iron content is suppressed to less than a prescribed value and of sulfuric acid. CONSTITUTION:A carbon paste electrode for an electric double layer capacitor is composed of powdery activated carbon and sulfuric acid; iron of 0.01% or less as a contained component is contained in the powdery activated carbon. That is to say, attention is directed to a relationship between the contained component of an impurity to be contained in the activated carbon constituting the carbon paste electrode and an electrical characteristic of the electric double layer capacitor, and self-discharge characteristic is stabilized while the iron content of the activated carbon is set at 0.01% or less. |
