ADDITIVES AND MODIFIED TETRABASIC SULFATE CRYSTAL POSITIVE PLATES FOR LEAD ACID BATTERIES

摘要

A positive electrode plate-making process for a lead acid battery that produces an active material precursor comprising tetrabasic lead sulfate crystals with an average crystal width less than 20 µm. The process includes mixing a lead and/or lead oxide powder and a paste additive with sulfuric acid to form a positive electrode paste composition, wherein the paste additive comprises ground tetrabasic lead sulfate crystals having an average particle size in the range of 1-20 µm. The paste is then cured on a positive battery grid to form a positive electrode plate having the desired active material precursor containing tetrabasic lead sulfate crystals with an average crystal width less than 20 µm. In an embodiment, curing is performed directly after applying the paste to the grid, with no intermediate steaming process.