Synthesis and Characterization of Ti Doped Lithium Iron Phosphate

Li1-4yTiyFePO4 (y = 0, 0.01, 0.02, 0.03, 0.04, and 0.05) cathode materials were prepared by solid-state reaction. The as-prepared samples were characterized by X-ray diffraction, X-ray absorption spectroscopy, cyclic charge-discharge, cyclic voltammograms, and electrochemical impendence spectroscopy...

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Published inECS transactions Vol. 45; no. 29; pp. 11 - 21
Main Authors Fang, Hui, Liang, Gan, Zhao, Liang, Wallace, Timothy, Arave, Hanu, Zhang, Lu-Lu, Ignatov, Alexander, Croft, Mark C
Format Journal Article
LanguageEnglish
Published The Electrochemical Society, Inc 02.04.2013
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Summary:Li1-4yTiyFePO4 (y = 0, 0.01, 0.02, 0.03, 0.04, and 0.05) cathode materials were prepared by solid-state reaction. The as-prepared samples were characterized by X-ray diffraction, X-ray absorption spectroscopy, cyclic charge-discharge, cyclic voltammograms, and electrochemical impendence spectroscopy. The x-ray diffraction results indicate that the Ti4+ incorporates into the LiFePO4 lattice, but the XAS reveals that small amount of doped Ti can also form TiO2-anatase impurities. At 0.1 C rate, doping of Ti causes a decrease in charge and discharge capacities. However, at higher C rate, the charge/discharge capacities are improved. 1 at.% doping sample Li0.96Ti0.01FePO4 exhibits the optimized electrochemical performance.
ISSN:1938-5862
1938-6737
DOI:10.1149/04529.0011ecst