| 摘要 |
PURPOSE:To improve high rate discharge performance without the sacrifice of low rate discharge capacity by using porous hollow microparticles mainly comprising lead dioxide or lead, each of which has a hollow in its inside and numerous micropores connecting the hollows to the outside in its wall, as an active material. CONSTITUTION:A lead acetate aqueous solution is dispersed in benzene by using a surface active agent, and this dispersion is dropped into dilute sulfuric acid solution with it stirred, and a precipitation is washed and dried to obtain porous hollow microparticles mainly comprising lead dioxide or lead each of which has a hollow 2 in its inside and micropores 4 connecting the hollows to the outside in its wall. The ratio d/D of the inner diameter d of the hollow 2 to the outer diameter D of the particle is larger than 40%. The particles are used in a part of or the whole positive and negative active materials. A sealed lead-acid battery having remarkably improved high rate performance without the sacrifice of low rate discharge capacity, excellent quick charge capacity, and long life is obtained. |
