NEGATIVE ELECTRODE FOR LEAD-ACID BATTERY

PROBLEM TO BE SOLVED: To reduce the quantity of sodium lignosulfate in a negative electrode active material so as to lower unsatisfactory filling to improve the charging acceptability, and to reduce the calorific power to prevent the lowering of low-temperature high efficiency discharge capacity by adding sodium lignosulfate to a negative electrode plate for lead-acid battery restraining the flocculation of lead during the charging to refine lead particles, and adding a specified quantity of phosphoric acid or boric acid thereto. SOLUTION: A negative electrode active material paste formed by adding an addition agent such as sodium lignosulfonate and sulfuric acid to lead powder composed mainly of lead oxide, is filled in a collector, and aged, dried, and formed to obtain a negative electrode plate for lead-acid battery. At this stage, phosphoric acid or boric acid at 0.01-0.1wt.% (vs. lead powder) is added to the negative electrode active material. With this composition, the quantity of sodium lignosulfonate as a surfactant is reduced, and the paste is hardened to lower the imperfect filling and to improve the conductivity of an electrode plate and the charge acceptability is thereby improved.