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

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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https://hal.archives-ouvertes.fr/hal-00343678
Contributor : Danielle Thomas Connect in order to contact the contributor
Submitted on : Tuesday, December 2, 2008 - 3:25:08 PM
Last modification on : Saturday, January 15, 2022 - 3:44:24 AM

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K. Zaghib, A. Mauger, F. Gendron, C. M. Julien. Relationship between local structure and electrochemical performance of LiFePO4 in Li-ion batteries. Ionics, Springer Verlag, 2008, 14, pp.271-278. ⟨10.1007/s11581-007-0181-0⟩. ⟨hal-00343678⟩

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