PbO2 in the Lead‐Acid Cell I . Formation from Three Typical Oxides

Three representative lead oxides for storage battery fabrication were mixed with water and to paste consistency. Each of these was hand pasted into antimonial and pure lead circular grids of standard SLI thickness. The plates were cured according to common practice for each oxide. The small circular plates were anodized in an electrolytic cell mounted directly on an x‐ray machine, and the diffraction patterns recorded at intervals throughout 72 hr of formation in 1.0585 sp gr . Beta was identified as the reaction product. At the end of formation, nominally 150% of theoretical requirement, the morphology of the was examined by electron microscopy. The crystals varied from small prismatic individuals to complex spherulitic formations.