Moisture driven aging mechanism of LiFePO4 subjected to air exposure

Marine Cuisinier, Jean Frédéric Martin, Nicolas Dupré, Atsuo Yamada, Ryoji Kanno, Dominique Guyomard

Research output: Contribution to journalArticle

48 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)238-241
Number of pages4
JournalElectrochemistry Communications
Volume12
Issue number2
DOIs
Publication statusPublished - Feb 2010
Externally publishedYes

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Keywords

  • Aging
  • Cathode
  • Li-ion
  • LiFePO
  • Moisture

ASJC Scopus subject areas

  • Electrochemistry

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