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Martin, J.-F., Cuisinier, M., Dupre, N., Yamada, A., Kanno, R. & Guyomard, D. (2011) More on the reactivity of olivine LiFePO4 nano-particles with atmosphere at moderate temperature. J. Power Sources, 196 2155–2163.
Added by: Laurent Cournède (2016-03-10 21:32:21) |
| Type de référence: Article DOI: 10.1016/j.jpowsour.2010.09.120 Numéro d'identification (ISBN etc.): 0378-7753 Clé BibTeX: Martin2011 Voir tous les détails bibliographiques  |
Catégories: ST2E Mots-clés: Aging, Cathodes, Li-ion battery, LiFePO4, Lithium batteries, lixfepo4, MAS NMR, miscibility gap, positive electrodes, room-temperature, spectroscopy, surface-chemistry Créateurs: Cuisinier, Dupre, Guyomard, Kanno, Martin, Yamada Collection: J. Power Sources |
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The changes appearing for LiFePO4-C nano-composites exposed to atmosphere at 120 C have been structurally and chemically examined by the use of TGA XRD XPS Mossbauer Li-7 MAS NMR and electrochemical methods The results conclude that a highly disordered phase resulting from the aging of LiFePO4 appears on the surface of the grains of the material is assigned to a phosphate phase and can insert lithium around 2 6V with poor reversibility The essential role of water has been investigated and clearly demonstrated Thus the aging mechanism occurring in hot humid air is completely different from a simple oxidation as well as from the aging process observed above 150 C and Involves the incorporation of hydroxyl groups In addition Fe2O3 formation has not been observed for such an aging in mild conditions (C) 2010 Elsevier B V All rights reserved
Added by: Laurent Cournède |