| 摘要 |
PROBLEM TO BE SOLVED: To provide a means for not shortening the service life of a sealed type lead-acid battery, even when the electrolyte is reduced. SOLUTION: For a retainer type, granular silica type, or gel type sealed type lead-acid battery, the density of a negative activating material is increased to 4.2-5.0 g/cm3 from conventional 3.8 g/cm3. Especially for the granular silica type, making the silica average particle diameter 100μm or less increases a life capability largely. For the retainer type battery, using a retainer mat having the average hole diameter of 15μm or less, or the thickness not less than the space between a positive and negative electrodes (pressed at 20 kg/dm2) brings about a good result. Adding 0.5-3 wt.% of carbon powder to the negative electrode activating material increases the life by a synergy effect.
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