| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery having high utilization rate of an active material and a long service life by including a conductive additive, formed by loading conductive powder on the surface of a porous body containing silicon as the main constituent in a paste type positive electrode plate or a paste type negative electrode plate. SOLUTION: A suspension is prepared by dissolving 50 pts.wt. of acetylene black, having an average particle diameter of 0.7 μm in refined water. A conductive additive is provided by adding and mixing a porous substance such as silica powder, glass fiber or glass powder in the suspension so that the acetylene black is adsorbed on its surface, and thereafter evaporating the water. A paste-like active material is prepared by adding water and dilute sulfuric acid in a mixture of lead powder containing lead monoxide as a main constituent, barium sulfate and lignin and by kneading them. A negative electrode plate of this lead-acid battery is formed, by adding the conductive additive in the active material and thereafter filling it in a Pb-Ca-Sn alloy lattice body and by drying it. Since the acetylene black is loaded in a substance, such as silica powder capable of retaining an electrolyte, the dispersion of sulfuric acid ions and current collection performance are improved and a short circuit hardly occurs. |
