View PDF Version
 
DOI: 10.1039/A807689H (Paper) Reference Section for: J. Mater. Chem., 1999, 9, 955-960

Oxidation mechanism of cobalt hydroxide to cobalt oxyhydroxide

(Note: The full text of this document is currently only available in the PDF Version )

V. Pralong, A. Delahaye-Vidal, B. Beaudoin, B. Gérand and J-M. Tarascon

Abstract

Although cobalt hydroxide is currently added to Ni(OH)2 paste to prepare nickel composite electrodes used in Ni-based rechargeable alkaline batteries, its redox chemistry in alkaline media is still poorly documented. The Co(OH)2→CoOOH oxidation reaction in KOH media was investigated, and found to be dependent upon the experimental conditions, namely, temperature, oxidizing agent and reaction time. In addition, this reaction was shown, as determined by means of X-ray diffraction, electronic microscopy and atomic absorption measurements, to occur through a two step mechanism process involving first a dissolution process followed by a solid state reaction. This dissolution step enables preparation, by adjusting the cycling conditions, of cobalt oxyhydroxide with well defined morphology and texture, thereby providing an opportunity to optimize its efficiency as an additive in nickel electrodes.

References

  1. M. Oshitani, H. Yufu, K. Takashima, S. Tsuji and Y. Massumaru, J. Electrochem. Soc., 1989, 136, 1590 CAS.
  2. L. Gautier, Thesis, University of Bordeaux I, 1995.
  3. B. E. Ezhov and O. G. Malandrin, J. Electrochem Soc., 1991, 138, 885 CAS.
  4. R. D. Armstrong and E. A. Charles, J. Power Sources, 1989, 25, 89 CrossRef CAS; D. H. Fritts, J. Electrochem Soc., 1982, 129, 118 CAS.
  5. J. Mc Breen, W. E. O'Grady, G. Tourillon, E. Dartyge, A. Fontaine and K. I. Pandya, J. Phys. Chem., 1989, 93, 6308 CrossRef CAS.
  6. R. D. Armstrong, G. W. D. Briggs and E. A. Charles, J. Appl. Electrochem., 1988, 18, 215 CAS.
  7. A. Audemer, A. Delahaye, R. Farhi, N. Sac-Epée and J.-M. Tarascon, J. Electrochem. Soc., 1997, 144, 2614 CAS.
  8. R. Soubirous, Thesis, University of Paris VII, 1970.
  9. P. Benson, G. W. D. Briggs and W. F. K. Wynne-Jones, Electrochim. Acta, 1964, 9, 275 CrossRef CAS.
  10. M. Figlarz, J. Guenot and J.-N. Tournemolle, J. Mater. Sci., 1974, 9, 772 CAS.
  11. M. Figlarz, J. Guenot and F. Fievet-Vincent, J. Mater. Sci., 1976, 11, 2267 CAS.
  12. W. Feitknecht, Bull. Soc. Chim. Fr., 1949, 5, D-31.
  13. J. Burkank, J. Electrochem. Soc., 1966, 113, no. 9.
  14. V. Pralong, A. Delahaye-Vidal, B. Beaudoin and J.-M. Tarason, J. Electrochem. Soc., submitted Search PubMed.