| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the durability of a capacitor or battery, by subjecting a collector formed out of a conductive material to a heat treatment to form oxide films on its surfaces. SOLUTION: A foil-form collector 1 having a predetermined size and formed out of a conductive material of aluminum (Al: about 99.99 wt.%) is used. The thickness of this collector 1 is set to about 50μm. Then, after using an electric furnace integrating thereinto an electric heater and storing the foil-form collector 1 in the furnace chamber of the electric furnace, it is subjected to a heat treatment at a heating temperature of about 200-500 deg.C under the atmospheric air or a reduced-pressure atmosphere in a predetermined time to form oxide films 2 on both its surfaces (front and rear). The thickness of the oxide film 2 is set to about 3-15μm. It is estimated that the crystallinity of the oxide film 2 is high. Thereafter, the collector 1 is coated with an active-substance layer 3. As a result, even when the collector 1 is used in a long term, its constituent conductive material can be suppressed from dissolving into an electrolyte.</p> |
