TITLE:
Enhanced Electrochemical Properties of LiFePO4 as Positive Electrode of Li-Ion Batteries for HEV Application
AUTHORS:
Christian M. Julien, Karim Zaghib, Alain Mauger, Henri Groult
KEYWORDS:
Olivine; Nanostructured Compounds; Local Structure; Magnetometry; Lithium-Ion Batteries
JOURNAL NAME:
Advances in Chemical Engineering and Science,
Vol.2 No.3,
July
11,
2012
ABSTRACT: LiFePO4 materials synthesized using FePO4(H2O)2 and Li2CO3 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-Fe2O3 or Fe2P) on the electrochemical response was examined. The electrochemical performances of the opti-mized LiFePO4 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, Li4Ti5O12, or graphite as negative electrodes.