| 摘要 |
PROBLEM TO BE SOLVED: To provide a lead-acid battery composed by improving discharge performance and the like, and by extending a service life. SOLUTION: This lead-acid battery is provided with a positive electrode active material having a composition containing a lead component as a main component with a tin component added as an additive. The material of the positive electrode active material is prepared by previously forming a composite oxide with the tin component together with at least a part of the lead component. In addition, it is preferable that at least either of the following conditions is satisfied: the number of tin atoms for forming the tin component is set to 1-20 % of the sum of the number of lead atoms for forming the lead component and the number of the tin atoms; and the composite oxide has a composition of Pb<SB>1-x</SB>Sn<SB>x</SB>O<SB>2</SB>, and the range of (x) is 0.02≤x≤0.2. COPYRIGHT: (C)2004,JPO
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