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Enhanced Electrochemical Properties of LiFePO<sub>4</sub> as Positive Electrode of Li-Ion Batteries for HEV Application
Physicochimie des Electrolytes, Collo?des et Systèmes Analytiques, Université Pierre et Marie Curie, Paris, France
Institut de Recherche d’Hydro-Québec, Varennes, Canada
Institut de Minéralogie et Physique de la Matière Condensée, Université Pierre et Marie Curie, Paris, France
Physicochimie des Electrolytes, Collo?des et Systèmes Analytiques, Université Pierre et Marie Curie, Paris, France
- 1 Physicochimie des Electrolytes, Collo?des et Systèmes Analytiques, Université Pierre et Marie Curie, Paris, France
- 2 Institut de Recherche d’Hydro-Québec, Varennes, Canada
- 3 Institut de Minéralogie et Physique de la Matière Condensée, Université Pierre et Marie Curie, Paris, France
- 4 Physicochimie des Electrolytes, Collo?des et Systèmes Analytiques, Université Pierre et Marie Curie, Paris, France
Advances in Chemical Engineering and Science·Volume 02 (2012)·Pages 321–329·Published 24 July 2012·DOI10.4236/aces.2012.23037
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Abstract
LiFePO 4 materials synthesized using FePO 4 (H 2 O) 2 and Li 2 CO 3 blend were optimized in view of their use as positive electrodes in Li-ion batteries for hybrid electric vehicles. A strict control of the structural properties was made by the combination of X-ray diffraction, FT-infrared spectroscopy and magnetometry. The impact of the ferromagnetic clus-ters (γ-Fe 2 O 3 or Fe 2 P) on the electrochemical response was examined. The electrochemical performances of the opti-mized LiFePO 4 powders investigated at 60℃ are excellent in terms of capacity retention (153 mAh·g -1 at 2C) as well as in terms of cycling life. No iron dissolution was observed after 200 charge-discharge cycles at 60℃ for cells containing Li foil, Li 4 Ti 5 O 12 , or graphite as negative electrodes.
KeywordsOlivineNanostructured CompoundsLocal StructureMagnetometryLithium-Ion Batteries
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