| 摘要 |
Improved positive electrodes for lead-acid batteries are disclosed, in which the said electrodes are initially fabricated such that: (1) the ratio between a calculated weight of formed, dry active material filled into a tube member and the weight of its corresponding lead spine is restricted to a maximum value of 1.5:1; (2) the ratio between the lateral cross-sectional area enclosed by a tube member and the lateral cross-sectional area of its corresponding lead spine is restricted to a maximum value of 5:1; and (3) the distance between the inner surface of a tube wall and the surface of its corresponding lead spine is restricted to a maximum value of 2.5 mm; for electrodes designed for use at the 5-hour discharge rate or greater, this distance is restricted to a maximum value of 1.8 mm. Thereafter the electrodes are subjected to a deliberate electro-chemically-induced corrosion of outer surface of the spines, to produce zones of high-density PbO2 immediately surrounding and in intimate contact with the spines. These high-density zones inhibit further corrosion of the spines. In this manner thinner-than-conventional tubular positive electrodes may be provided having a cycle life characteristic at least as good as that of conventional electrodes, and battery cells utilizing a plurality of these electrodes will demonstrate a substantially improved energy density characteristic. |
