| 摘要 |
PURPOSE:To increase the capacity of discharge, by filling a paste mixed with graphite, then subjecting the filled paste to aging, drying and formation, and thereafter thermally expanding the graphite in a drying process. CONSTITUTION:When lead monoxide and sulfuric acid are mixed and kneaded together, graphite is added thereto. The mixture is then applied to a lead lattice to obtain a positive electrode plate not yet subjected to formation. After the plate is subjected to the formation, the temperature of the plate is raised in a drying process. In the formation, the graphite reacts with the sulfuric acid to produce an inter-layer compound. In the drying process, the inter-layer compound is thermally expanded, and the positive electrode plate is also expanded so that a positive electrode active material is made porous and cracks are made in the plate. The quantity of sulfuric acid in the positive electrode plate already subjected to the formation can be much increased by previously causing the expanded graphite to be contained in the positive electrode active material. |
