THE PLATE MATERIALS OF THE LEAD-ACID CELL. PART 4 - ANODIC OXIDATION OF THREE REPRESENTATIVE OXIDES.
NAVAL RESEARCH LAB WASHINGTON D C
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Three representative lead oxides, designated A, C, and H, for storage-battery fabrication were mixed with water and H2SO4 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 were recorded at intervals throughout 72 hr of formation in 1.0585 sp gr H2SO4. X-ray diffraction patterns from the unformed pastes showed the major component was tribasic lead sulfate in all three. The surfaces of plates made from oxides A and H were primarily basic lead carbonate hydrocerussite, and the surfaces of plates made with oxide C were largely tribasic lead sulfate. On completion of anodization, nominally 150 of the theoretical requirement on a weight basis, the pastes were blotted and dried in air at room temperature. The formed paste was removed from the grids for electron-microscope examination by carbon replication. The PbO2 had a range of morphologies, and the individual crystallites varied from about 0.5 microns to less than 0.1 microns. Some prismatic crystals with branching suggestive of multiple twinning were present in past A and appeared less frequently in the other two pastes. Agglomerates, several microns in size, of prismatic crystallites were present in all pastes. Paste H gave rise to the largest individual crystallites which were about 0.5 microns in diameter. Author
- Electrochemical Energy Storage