| 摘要 |
PURPOSE:To increase life of a lead electrode by making zirconyl phosphate and sodium pyrophosphate contain in an electrode active material and suppressing transfer of lead ion to the outside of the active material by lead ion absorbing ability of zirconyl phosphate. CONSTITUTION:180cc of water, 5wt% of zirconyl phosphate powder to lead powder, and 3wt% of sodium pyrophosphate to lead powder are added to 1kg of lead powder. They are kneaded, then 100cc of sulfuric acid having a specific gravity of 1.40 is added and again they are kneaded to make a paste. The paste is spreaded on the lead alloy grid to form an electrode for a lead-acid battery. By strong absorbing ability of zirconyl phosphate to lead ion, lead ion dissolved during charge-discharge is absorbed near the original place. Therefore, transfer of lead ion to bulk or other place of a plate is suppressed. Thereby, generation of fine crystals is suppressed and life of electrode is increased. |
