| 摘要 |
PURPOSE: To improve resistance to overdischarge by coating nickel or chrome which has high chemical stability on copper foil at a specified thickness to be used as a negative electrode. CONSTITUTION: On both surfaces of a negative electrode collector 9 havig coating of nickel or chrome formed on copper foil in a plating method at a thickness of 1μm or more, synthetic paint of carbon or the like is applied to be a strip of a negative electrode 1. In the meanwhile, a positive electrode 2 is formed by applying mixed paint of LiCoO2 or the like on both surfaces of a collector 10 of aluminum foil. The negative electrode 1, and the positive electrode 2 are laminated through a separator 3 to be a spiral electrode body. By thus coating the negative electrode 1 with thin film of nickel or chrome, it is passivated to improve chemical stability, thereby capacity deterioration by overdischarge can be restricted. |
