| 摘要 |
PROBLEM TO BE SOLVED: To improve recoverability of battery capacity particularly after over- discharging a battery in a low rate current by forming a passive state layer between a positive electrode grid surface and an active material, and restraining the deterioration of adhesion between a grid and the active material thereby. SOLUTION: The tin concentration of a rolled sheet composed of a lead alloy used for a positive electrode expanded grid is set not more than 2.0 wt.%, lead alloy foil having the tin concentration not less than 2.0 wt.% is stuck to a surface of the rolled sheet composed of a lead alloy, and a plate on which the grid volume per plate area of a positive electrode is set not less than 0.8 mm/mm is used.
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