| 摘要 |
PROBLEM TO BE SOLVED: To select a carbonaceous material optimum for the main component of a polarizable electrode used for a capacitor by setting a current value measured after 100 ms from time when a step is started to be not more than the specified rate of a maximum current value immediately after the start of a step. SOLUTION: An electric double layer capacitor is constituted of a positive electrode, a negative electrode and nonaqueous electrolysis solution. The positive electrode or the negative electrode is made to be a polarized electrode which is mainly composed of a carboneous material having high responsiveness. A material whose specific surface area of activated carbon, polyacene and carbon black is large is used for the carboneous material. The carboneous material has a characteristic that a current value measured after 100 ms from time when a step is started is set to be not more than about 10% of the maximum current value immediately after the start of the step in measurement for stepping immersion potential from immersion potential by +50 mV by a chronoamperometry method. Thus, the material optimum for the main component of the polarizable electrode used for the capacitor is selected, capacity is enlarged with condition of large current and output is made to be high. |
