| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 180718 | Electrochemistry Communications | 2010 | 4 Pages |
Abstract
The impact of air exposure on LiFePO4–C nanocomposites has been investigated at moderate temperature. We show here that the storage in 120 °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.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Marine Cuisinier, Jean-Frédéric Martin, Nicolas Dupré, Atsuo Yamada, Ryoji Kanno, Dominique Guyomard,