| 摘要 |
PURPOSE:To prevent a drop in function by employing a negative electrode where a sub-active material having nobler discharge potential than a main active material is used, for a negative electrode made of Li or a main active material capable of storing and releasing Li, and realizing the capability of predicting the exhaust of capacity via the maintenance of negative electrode capacity at such level as equal to or less than positive electrode capacity. CONSTITUTION:A positive electrode 1 having MnO2 as an active material is made of 85 pts.wt. of MnO2, 10 pts.wt. of carbon black and 5 pts.wt. of binder resin, and laid on the stainless steel foil of a package as a positive electrode current collector in common. A Li foil 2 as a negative electrode active material, and a LiAl alloy 3 as a sub-active material are stacked on a negative electrode current collector 6 made of stainless steel foil. The sub-active material 3 is provided, so as to occupy a part of area occupied by a negative electrode. A separator 4 is impregnated with a LiClO4-PC (propylene carbonate) electrolyte. In addition, a sealing material 7 made of denatured polypropylene is heated and fused onto current collectors 5 and 6. In this case, a ratio of the area of the negative electrode occupied by the active material 3 is approximately 20%. The potential of the sub-active material 3 is approximately 0.4V nobler than that of Li as the main active material. Also, the potential of the material 3 after discharge is approximately equal to the potential of the positive electrode 1 after discharge. Further, the capacity of both positive and negative electrode is kept equal. |
