The Outcome of Cobalt in the Nickel–Cobalt Oxyhydroxide Electrodes of Alkaline Batteries
| Autor: | Valerie Pralong, A. Delahaye-Vidal, B. Beaudoin, Y. Chabre, Jean-Marie Tarascon |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
inorganic chemicals
Materials science Cobalt hydroxide Inorganic chemistry chemistry.chemical_element engineering.material Condensed Matter Physics Redox Electronic Optical and Magnetic Materials Inorganic Chemistry chemistry.chemical_compound Nickel chemistry Coating Materials Chemistry Ceramics and Composites engineering Hydroxide Physical and Theoretical Chemistry Alkaline battery Dissolution Cobalt |
| Zdroj: | Journal of Solid State Chemistry. 162:270-281 |
| ISSN: | 0022-4596 |
| DOI: | 10.1006/jssc.2001.9293 |
| Popis: | The evolution of cobalt hydroxide used as a coating for nickel hydroxide electrodes has been studied as a function of the redox potential window and upon cycling. From both chemical and electrochemical studies, it is shown that (i) upon deep discharges cobalt tends to migrate from the coating to the current collector and (ii) upon heavy cycling in the limited 1–1.4V potential range a complete reorganization of the active material occurs. In the latter case, using X-ray diffraction, electron microscopy, and potentiodynamic intermittent technique, we identified the formation of a Ni1−xCox(OH)2(CO3)z·rH2O-type phase through dissolution reprecipitation processes involving both cobalt and nickel species. From these findings, the conditions required to preserve the benefits of cobalt additives are given. |
| Databáze: | OpenAIRE |
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