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Issue 11, 2016
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Identifying the redox activity of cation-disordered Li–Fe–V–Ti oxide cathodes for Li-ion batteries

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Abstract

Cation-disordered oxides have recently shown promising properties on the way to explore high-performance intercalation cathode materials for rechargeable Li-ion batteries. Here, stoichiometric cation-disordered Li2FeVyTi1−yO4 (y = 0, 0.2, 0.5) nanoparticles are studied. The substitution of V for Ti in Li2FeVyTi1−yO4 increases the content of active transition metals (Fe and V) and accordingly the amount of Li+ (about (1 + y)Li+ capacity per formula unit) that can be reversibly intercalated. It is found that Fe3+/Fe2+ and V4+/V3+ redox couples contribute to the overall capacity performance, whereas Ti4+ remains mainly inert. There is no evidence for the presence of Fe4+ species after charging to 4.8 V, as confirmed from the ex situ57Fe Mössbauer spectroscopy and the Fe K-edge absorption spectra. The redox couple reactions for iron and vanadium are examined by performing in situ synchrotron X-ray absorption spectroscopy. During charging/discharging, the spectral evolution of the K-edges for Fe and V confirms the reversible Fe3+/Fe2+ and V4+/V3+ redox reactions during cycling between 1.5 and 4.8 V.

Graphical abstract: Identifying the redox activity of cation-disordered Li–Fe–V–Ti oxide cathodes for Li-ion batteries

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Publication details

The article was received on 07 Jan 2016, accepted on 05 Feb 2016 and first published on 10 Feb 2016


Article type: Paper
DOI: 10.1039/C6CP00131A
Citation: Phys. Chem. Chem. Phys., 2016,18, 7695-7701
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    Identifying the redox activity of cation-disordered Li–Fe–V–Ti oxide cathodes for Li-ion batteries

    R. Chen, R. Witte, R. Heinzmann, S. Ren, S. Mangold, H. Hahn, R. Hempelmann, H. Ehrenberg and S. Indris, Phys. Chem. Chem. Phys., 2016, 18, 7695
    DOI: 10.1039/C6CP00131A

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