Heat treatment of α- and β-battery lead dioxide and its relationship to capacity loss
| Autor: | N. Chelali, B. Djellouli, R. Fitas, L. Zerroual |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Battery (electricity)
Renewable Energy Sustainability and the Environment Chemistry Inorganic chemistry Energy Engineering and Power Technology Mineralogy Lead dioxide Atmospheric temperature range Kinetic energy Ion chemistry.chemical_compound Differential thermal analysis Electrical and Electronic Engineering Physical and Theoretical Chemistry Lead–acid battery Capacity loss |
| Zdroj: | Journal of Power Sources. 58:225-229 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/s0378-7753(96)02372-5 |
| Popis: | It is well known that lead dioxide contains, what has been called, ‘structural water’. Present in the form of OH− ions replacing O2− 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-PbO2 samples were evaluated in H2SO4 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-PbO2 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-PbO2 needs an energy twice that of the α-form. |
| Databáze: | OpenAIRE |
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