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High Performance of Lithium Iron Phosphates for HEV with Quality Control Made by Magnetometry

Published online by Cambridge University Press:  26 February 2011

Christian M Julien ,
Alain Mauger ,
Karim Zaghib  and
François Gendron
Christian M Julien
Affiliation:
[email protected], University Paris 6, INSP, 140 rue de Lourmel, Paris, 75015, France, 33144274561, 33144273882
Alain Mauger
Affiliation:
[email protected], CNRS, MPPU, 140 rue de Lourmel, Paris, 75015, France
Karim Zaghib
Affiliation:
[email protected], IREQ, 1800 Bd Lionel-Boulet, Varennes, J3X 1S1, Canada
François Gendron
Affiliation:
[email protected], University Paris 6, INSP, 140 rue de Lourmel, Paris, 75015, France
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Abstract

Optimized LiFePO4 positive electrode for Li-ion batteries was obtained after severe control of the fundamental properties of material. The nanoscopic structure and magnetic properties of a series of carbon-coated LiFePO4 particles prepared under various conditions were analyzed with XRD, FTIR, Raman and SQUID magnetometry. We evaluate intrinsic and extrinsic properties. The existence of low content of nano-sized ferromagnetic particles was evidenced by magnetic measurements in samples grown from iron(II) oxalate; such ferromagnetic clusters do not exist in the optimised samples grown from FePO4(H2O)2. Other impurity phases such as Fe2P, Li3Fe2(PO4)3, FeP2O7 were also detected for particular conditions of preparation. The impact of the carbon coating on the electrochemical properties is reported. Li-ion cells show excellent cyclability after 200 cycles at 60 °C without iron dissolution.

Keywords

energy-storagemagnetic propertiesRaman spectroscopy
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 973: Symposium BB – Mobile Energy , 2006 , 0973-BB05-03
Copyright
Copyright © Materials Research Society 2007

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References

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