| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lead storage battery with both improvement in utilization efficiency and elongation of life of its cathode, in a liquid-type and sealed-type for use for bicycles, four-wheeled automobiles and industries. <P>SOLUTION: For the lead storage battery with expanded graphite and bismuth added to a cathode active material in a cathode made by filling a substrate with a cathode active material, a desirable addition amount of the expanded graphite is to be 0.1% by mass or more and 2.0% by mass or less of the cathode active material, and that of a pure metal portion of the bismuth is to be 0.01% by mass or more and 0.5% by mass or less of the cathode active material. <P>COPYRIGHT: (C)2009,JPO&INPIT |
