| 摘要 |
PURPOSE:To prevent decrease in initial capacity and increase life by applying slurry prepared by adding alpha-PbO2 in a Pb-Ca alloy substrate and drying it, then filling paste in the substrate. CONSTITUTION:Slurry mainly comprising lead and dilute sulfuric acid and containing alpha-PbO2 is applied to a Pb-Ca alloy substrate, and after drying the paste, usual paste is filled in the substrate to form a cathode plate. In the cathode plate, since alpha-PbO2 which is not easily reduced electrochemically exists near the substrate, discharge reaction does not easily take place near the substrate. Therefore, decrease in electrical contact between the substrate and active material is suppressed without sacrifice of active material utilization. The lead- acid battery B manufactured based on the invention showed the life exceeding 125 cycles, and the battery C having cathode plates obtained by adding 10% alpha-PbO2 to the weight of cathode active material to the paste showed the life of 175 cycles. |
