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Issue 48, 2016
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MnSn2 negative electrodes for Na-ion batteries: a conversion-based reaction dissected

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Abstract

To date, the most common negative electrodes used in Na-ion batteries are based on hard carbons, offering around ca. 250 mAh g−1 gravimetric capacity but only 400 mAh cm−3 volumetric capacity due to their low density. Negative electrode materials based on intermetallics could outperform this with both a higher gravimetric capacity (>400 mAh g−1) and a higher volumetric capacity (>1000 mAh cm−3) but often struggle with cycling stability. Here MnSn2 is investigated as an electrode material for Na-ion batteries for the first time and delivers 400 mAh g−1 for over 50 cycles, by far outperforming its parent (Sn) in terms of cycling stability. The 1st cycle and the 10th cycle of the Na/MnSn2 reaction are probed using electrochemical methods and operando XRD to reveal the formation and ageing reaction mechanisms. It is shown that MnSn2 benefits from a robust reaction mechanism where all features seen in the 1st cycle (insertion into MnSn2, formation of Na15Sn4, Na15−xSn4, Na7Sn3 and MnSn2 reformation) are still visible in the 10th cycle, explaining the cycling stability.

Graphical abstract: MnSn2 negative electrodes for Na-ion batteries: a conversion-based reaction dissected

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Publication details

The article was received on 08 Sep 2016, accepted on 05 Nov 2016 and first published on 07 Nov 2016


Article type: Paper
DOI: 10.1039/C6TA07788A
J. Mater. Chem. A, 2016,4, 19116-19122

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    MnSn2 negative electrodes for Na-ion batteries: a conversion-based reaction dissected

    L. O. Vogt and C. Villevieille, J. Mater. Chem. A, 2016, 4, 19116
    DOI: 10.1039/C6TA07788A

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