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A new active Li–Mn–O compound for high energy density Li-ion batteries

Nature Materials volume 15, pages 173–177 (2016)Cite this article

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Abstract

The search for new materials that could improve the energy density of Li-ion batteries is one of today’s most challenging issues. Many families of transition metal oxides as well as transition metal polyanionic frameworks have been proposed during the past twenty years1,2. Among them, manganese oxides, such as the LiMn2O4 spinel or the overlithiated oxide Li[Li1/3Mn2/3]O2, have been intensively studied owing to the low toxicity of manganese-based materials and the high redox potential of the Mn3+/Mn4+ couple. In this work, we report on a new electrochemically active compound with the ‘Li4Mn2O5’ composition, prepared by direct mechanochemical synthesis at room temperature. This rock-salt-type nanostructured material shows a discharge capacity of 355 mAh g−1, which is the highest yet reported among the known lithium manganese oxide electrode materials. According to the magnetic measurements, this exceptional capacity results from the electrochemical activity of the Mn3+/Mn4+ and O2−/O− redox couples, and, importantly, of the Mn4+/Mn5+ couple also.

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Figure 1: XRPD analysis.
Figure 2: TEM analyses.
Figure 3: Electrochemical properties.
Figure 4: Magnetic measurements.

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Acknowledgements

The authors gratefully acknowledge S. Gascoin for her help in numerous XRPD collections. The authors gratefully acknowledge the CNRS.

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Authors and Affiliations

  1. Laboratoire de Cristallographie et Sciences des Matériaux CRISMAT, ENSICAEN, Université de Caen, CNRS, 6 Boulevard Maréchal Juin, F-14050 Caen, France

    M. Freire, D. Chateigner, O. I. Lebedev, A. Maignan & V. Pralong

  2. Saft, Direction de la Recherche, 111/113 Boulevard Alfred Daney, 33074 Bordeaux, France

    M. Freire & C. Jordy

  3. Institute of Solid State Chemistry and Mechanochemistry SB RAS, 18 Kutateladze, Novosibirsk 630128, Russia

    N. V. Kosova

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  1. M. Freire
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  3. C. Jordy
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  5. O. I. Lebedev
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  7. V. Pralong
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Contributions

M.F., N.V.K. and V.P. contributed to the synthesis of the materials and performed the electrochemical and chemical analysis. M.F. and A.M. performed the magnetic analysis of the samples. D.C. analysed the XRPD data and O.I.L. carried out the TEM analysis. C.J., N.V.K. and V.P. conceived and designed the project. All the authors contributed to writing the paper.

Corresponding author

Correspondence to V. Pralong.

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The authors declare no competing financial interests.

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Freire, M., Kosova, N., Jordy, C. et al. A new active Li–Mn–O compound for high energy density Li-ion batteries. Nature Mater 15, 173–177 (2016). https://doi.org/10.1038/nmat4479

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