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Issue 11, 2012
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Structural, magnetic and electrochemical study of a new active phase obtained by oxidation of a LiFePO4/C composite

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Abstract

In this work, a new phase produced by controlled oxidation of a LiFePO4/C composite has been isolated and characterized. This new compound preserves mainly an olivine structure, but the complete oxidation of Fe is implied. A significant iron mis-site disorder and vacancy formation is proposed. The new phase demonstrated possession of different spectroscopic, magnetic and electrochemical properties from triphilite–heterosite. AC and DC magnetic susceptibility and specific heat measurements showed that the new phase presented spin-glass behavior. Electrochemical cycling showed that the new phase reacted at 2.5 V, which is a different potential to the heterositeversus a Li anode. Moreover, it provoked reversion to the triphilite–heterosite system, although a fraction of the material remained as the oxidized phase.

Graphical abstract: Structural, magnetic and electrochemical study of a new active phase obtained by oxidation of a LiFePO4/C composite

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Publication details

The article was received on 08 Sep 2011, accepted on 03 Dec 2011 and first published on 30 Jan 2012


Article type: Paper
DOI: 10.1039/C2JM14462J
Citation: J. Mater. Chem., 2012,22, 4735-4743
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    Structural, magnetic and electrochemical study of a new active phase obtained by oxidation of a LiFePO4/C composite

    V. Palomares, A. Goñi, A. Iturrondobeitia, L. Lezama, I. de Meatza, M. Bengoechea and T. Rojo, J. Mater. Chem., 2012, 22, 4735
    DOI: 10.1039/C2JM14462J

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