THE POSITIVE PLATE OF THE LEAD-ACID CELL. A CRITICAL REVIEW OF RECENT LITERATURE.
NAVAL RESEARCH LAB WASHINGTON D C
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Recent scientific literature on the positive plate of the lead-acid cell has critically reviewed. The principal constituent of the plate is the nonstoichiometric oxide PbO1.80 - 1.98OH0.11 - 0.26, which under normal conditions behaves as a semimetal, the free electrons in the conduction band imparting a conductivity of 1000 mhocm. Two polymorphic crystal forms are known, and the electrochemical characterization of each has been investigated. The significance of the geometrical morphology and the function of Sb in the positive plate have been shown to be related Sb acts to preserve the small particle size of the surface crystals that give high electrochemical capacity to the plate. O2 overvoltage is different on the two polymorphs, and it is thought that the form having the lower overvoltage serves to prolong the life of the plates in overcharge tests. In this review particular emphasis has been placed on relating the research findings to cell behavior and to pointing out areas where further work is required. Author
- Electrochemical Energy Storage