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Issue 45, 2013
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Electrochemical insertion of Li into nanocrystalline MnFe2O4: a study of the reaction mechanism

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Abstract

The study of the mechanism of Li insertion into nanosized partially inverse spinel MnFe2O4 applying X-ray diffraction, in situ quick X-ray absorption spectroscopy, Mössbauer spectroscopy, high resolution transmission electron microscopy, 7Li MAS NMR, and electrochemical measurements yields a comprehensive picture of the individual steps occurring during Li uptake. At the very early beginning of the reaction Fe3+ on the tetrahedral site is reduced and moves to empty octahedral sites. Increasing the amount of Li to 0.7 per MnFe2O4, further Fe3+ is reduced and Mn2+ residing on the tetrahedral site moves to empty octahedral sites thus forming a defect NaCl-type structure. At least for 2 Li per MnFe2O4 reflections of the spinel disappeared in the X-ray powder pattern and only those of a monoxide are observed. No indications were found for a phase separation and Fe and Mn are homogeneously distributed over the sample. Further Li uptake leads to a stepwise conversion of the material and after insertion of 8 Li/MnFe2O4 only nanosized Mn, Fe, and Li2O are detected. After a capacity loss at the beginning of Li insertion, a constant capacity of about 266 mA h g−1 is reached after 100 cycles discharging–charging the material.

Graphical abstract: Electrochemical insertion of Li into nanocrystalline MnFe2O4: a study of the reaction mechanism

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The article was received on 14 Aug 2013, accepted on 23 Sep 2013 and first published on 25 Sep 2013


Article type: Paper
DOI: 10.1039/C3RA44383C
Citation: RSC Adv., 2013,3, 23001-23014
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    Electrochemical insertion of Li into nanocrystalline MnFe2O4: a study of the reaction mechanism

    S. Permien, H. Hain, M. Scheuermann, S. Mangold, V. Mereacre, A. K. Powell, S. Indris, U. Schürmann, L. Kienle, V. Duppel, S. Harm and W. Bensch, RSC Adv., 2013, 3, 23001
    DOI: 10.1039/C3RA44383C

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