Heat treatment of α- and β-battery lead dioxide and its relationship to capacity loss

It is well known that lead dioxide contains, what has been called, ‘structural water’. Present in the form of OH − ions replacing O 2− ions in the anionic sublattice, the ‘structurally bonded’ water can be removed by heating, in the temperature range from 150 to 250 °C. In the present study, the dis...

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Bibliographic Details
Published in:Journal of power sources 1996, Vol.58 (2), p.225-229
Main Authors: Fitas, R., Zerroual, L., Chelali, N., Djellouli, B.
Format: Article
Language:English
Subjects:
Batteries
Capacity
Heat treatment
Lead dioxides
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Summary:It is well known that lead dioxide contains, what has been called, ‘structural water’. Present in the form of OH − ions replacing O 2− ions in the anionic sublattice, the ‘structurally bonded’ water can be removed by heating, in the temperature range from 150 to 250 °C. In the present study, the discharge capacities of fresh and heat-treated (140 and 230 °C, respectively) α- and β-PbO 2 samples were evaluated in H 2SO 4 solution of 1.28 g cm −3 sp. gr. at different current densities of 5 to 40 mA cm −2. It was found that the capacity decreased when structural water was removed. This loss of capacity is important when α-PbO 2 samples are considered. The energy of dehydroxilation was deduced by applying kinetic considerations to thermograms, obtained experimentally. The removal of the OH − groups from β-PbO 2 needs an energy twice that of the α-form.
ISSN:0378-7753
1873-2755
DOI:10.1016/S0378-7753(96)02372-5