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Article Dans Une Revue Electrochemistry Communications Année : 2010

Moisture driven aging mechanism of LiFePO4 subjected to air exposure

Résumé

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.

Dates et versions

hal-00468418 , version 1 (30-03-2010)

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Citer

M. Cuisinier, J.F. Martin, Nicolas Dupre, A. Yamada, R. Kanno, et al.. Moisture driven aging mechanism of LiFePO4 subjected to air exposure. Electrochemistry Communications, 2010, 12 (2), pp.238. ⟨10.1016/j.elecom.2009.12.003⟩. ⟨hal-00468418⟩
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