Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 12, Issue 2, Pages 238-241Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2009.12.003
Keywords
Li-ion; Cathode; LiFePO4; Aging; Moisture
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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.
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