Journal
IONICS
Volume 14, Issue 4, Pages 271-278Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-007-0181-0
Keywords
olivines; local structure; magnetometry; lithium-ion batteries
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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 (gamma-Fe2O3 or Fe2P) on the electrochemical response is examined. The electrochemical performance of the optimized LFP powders investigated at 60 degrees 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 degrees C for cells containing Li foil, Li4Ti5O12, or graphite as negative electrodes.
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