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Relationship between local structure and electrochemical performance of LiFePO4 in Li-ion batteries

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Abstract

This work is devoted to the study of fundamental properties of LiFePO4 (LFP) olivine in view of the optimization of this material for its use as a positive electrode material in Li-ion batteries. The investigation of the electronic and magnetic properties appears to be successful for the detection of a small amount of impurities. By the combination of X-ray diffraction, optical spectroscopy, and magnetometry, we characterize the local structure and the morphology of LFP particles. The impact of the ferromagnetic clusters (γ-Fe2O3 or Fe2P) on the electrochemical response is examined. The electrochemical performance of the optimized LFP powders investigated at 60 °C is excellent in terms of capacity retention (153 mAh/g at 2 C) as well as cycling life. No iron dissolution was observed after 200 charge–discharge cycles at 60 °C for cells containing Li foil, Li4Ti5O12, or graphite as negative electrodes.

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Authors and Affiliations

  1. Institut de Recherche d’Hydro-Québec (IREQ), 1800 boulevard Lionel-Boulet, Varennes, QC, Canada, J3X 1S1

    K. Zaghib

  2. IMPMC, UMR 7590, Université Pierre et Marie Curie, 140 rue de Lourmel, 75015, Paris, France

    A. Mauger

  3. Institut des Nano-Sciences de Paris, UMR 7588, Université Pierre et Marie Curie, 140 rue de Lourmel, 75015, Paris, France

    F. Gendron & C. M. Julien

Authors
  1. K. Zaghib
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  2. A. Mauger
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  3. F. Gendron
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  4. C. M. Julien
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Correspondence to C. M. Julien.

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Zaghib, K., Mauger, A., Gendron, F. et al. Relationship between local structure and electrochemical performance of LiFePO4 in Li-ion batteries. Ionics 14, 271–278 (2008). https://doi.org/10.1007/s11581-007-0181-0

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  • DOI: https://doi.org/10.1007/s11581-007-0181-0

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