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Cuisinier, M., Martin, J.-F., Dupre, N., Yamada, A., Kanno, R. & Guyomard, D. (2010) Moisture driven aging mechanism of LiFePO4 subjected to air exposure. Electrochem. Commun. 12 238–241.
Added by: Laurent Cournède (2016-03-10 21:37:33) |
| Type de référence: Article DOI: 10.1016/j.elecom.2009.12.003 Numéro d'identification (ISBN etc.): 1388-2481 Clé BibTeX: Cuisinier2010 Voir tous les détails bibliographiques  |
Catégories: ST2E Mots-clés: Aging, Cathode, Cathodes, Li-ion, LiFePO4, Moisture, Stability Créateurs: Cuisinier, Dupre, Guyomard, Kanno, Martin, Yamada Collection: Electrochem. Commun. |
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The impact of air exposure on LiFePO4-C nanocomposites has been investigated at moderate temperature. We show here that the storage in 120 degrees C hot air for 30 days leads not only to the material delithiation but also to the formation of an amorphous ferric phosphate side-phase, accounting for 38\% of the total iron. The formed phase is found to be partially hydrated, suggesting a water-driven aging mechanism and a proposed hypothetic formula: LixFePO4(OH)(x). The side-phase displays new electrochemical activity but poor cyclability and the overall battery performance is thus deteriorated. The regeneration of pristine structure, together with the performance recovery can be achieved by a simple thermal treatment under inert atmosphere. (C) 2009 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède |