| 摘要 |
PURPOSE:To enhance a heavy-load discharging characteristic by setting a compounding ratio of a conductive material added in an electrode agent layer disposed outside of a collector larger by an adequate ratio than that of another conductive material added in an electrode agent layer disposed inside the collector. CONSTITUTION:When a compounding ratio of a conductive material added in an electrode agent layer disposed outside a collector around which a laminated electrode is spirally wound is Xawt% and a compounding ratio of a conductive material added in an electrode agent layer disposed inside the collector is Xbwt%, Xa/Xb ranges from 1.17 to 1.83, thereby increasing a discharging capacity at the time of a heavy load without decreasing a discharging capacity at the time of a light load. As the conductive material added in the electrode agent, stable and inexpensive graphite powder having low specific gravity is used. |
