| 摘要 |
PURPOSE:To reduce the dispersion of the closed-circuit voltage and stabilize the quality by setting a deposition speed within a specific range in depositing and forming a lead dioxide layer on the surface of a molded positive electrode black mix. CONSTITUTION:Silver (II) oxide is molded at a pressure of 5t/cm<2> to form a molded body, it is immersed in a mixed liquid with a volume ratio of 9:1 between a caustic potash aqueous solution and ethyl alcohol and a portion with a depth of 100mum from the surface is reduced to silver ( I ) oxide, then it is immersed in a liquid made by dissolving lead oxide (PbO) in saturation in a caustic soda aqueous solution of 30wt%, and a lead dioxide layer is deposited and formed on the surface of a black mix 1 at a deposition speed of 1.5-15mg/cm<2> per hour, e.g., 7mg/cm<2>. Then, said molded positive electrode black mix 1 is inserted into a positive electrode can 2 injected with part of an alkaline electrolyte, and a separator 3 and an electrolyte absorber 4 are mounted in sequence. Next, an annular gasket 7 is inserted in the peripheral section and is coupled with a negative electrode terminal plate 5 filled with a negative electrode 6 using amalgamated zinc as an active material and most of the remaining alkaline electrolyte, and the opening section of the positive electrode can 2 is tightened and bent inward so that its inner periphery is brought into contact by pressure with the annular gasket 7 for sealing. |
