PURPOSE: To improve the life characteristic by immersing a supporter in acid solution such as acetic acid, nitric acid to dissolve the lead oxide layer on the surface then applying lead paste on the supporter adhered with solution.
CONSTITUTION: The surface of a supporter made of lead alloy is oxidized to PbO. The surface of paste material or lead powder is also oxidized to PbO. When immersing the supporter into acid solution for dissolving lead oxide, metal lead is exposed on the surface. When applying paste on the supporter adhered with solution, lead oxide in the paste is dissolved in said solution to expose metal lead on the paste face contacting with the supporter. Consequently metal lead on the surface of the supporter will contact with metal lead in the paste to improve the tightness thus to suppress deterioration of initial capacity in slow discharge cycle.
WATANABE KEIICHI
JINBO HIROYUKI
FUKUDA SADAO
TAKAHASHI KATSUHIRO
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