Conversion of tribasic lead sulfate to lead dioxide in lead/acid battery plates 1. Relationship between the phase compositions of plates in the cured and formed states

The influence of the initial amount of H2SO4 added to lead powder on the phase compositions of plates in the curred and formed states has been studied. IR spectra, X-ray diffraction, scanning electron microscope observations, and wet-chemical analysis are used as techniques of investigation. It was found that the phase composition of the paste depends on the H2SO4:oxidized lead powder ratio. In addition, it is found that α- and β-PbO2 are formed in the lead/acid battery positive from 3PbO·PbSO4·H2O. the amounts of these two compounds were strongly affected when varying the quantity of H2SO4 with respect to the lead powder.