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Issue 21, 2017
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Achieving ultralong life sodium storage in amorphous cobalt–tin binary sulfide nanoboxes sheathed in N-doped carbon

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Abstract

The interest in Na-ion batteries (NIBs) is growing exponentially since Na is more abundant and affordable than Li for large-scale energy storage applications. However, the lack of truly durable and high-capacity electrode materials still remains a key bottle-neck issue for the development of practical NIBs. In this work, we report the rational design of an ultra-long life anode material for NIBs by integrating the structural merits of hollow nanostructures, carbon nanocoating and amorphous structures together into a binary metal sulfide system. Amorphous CoSnSx nanoboxes sheathed in N-doped carbon are yielded by templating against single-crystalline CoSn(OH)6 nanoboxes, followed by polymer nanoplating and carbonization. The synergy of diverse structural features enables a robust structure and fast reaction kinetics for Na storage in the CoSnSx@NC anode, leading to an exceptionally long cycle life of 4000 cycles with very slow capacity loss (0.0075% per cycle) and high power output. The full cells assembled from the Na3V2(PO4)3/C cathode and the CoSnSx@NC anode deliver a high energy density of up to 86.6 W h kg−1, as well as good capacity retention at high current rate.

Graphical abstract: Achieving ultralong life sodium storage in amorphous cobalt–tin binary sulfide nanoboxes sheathed in N-doped carbon

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Publication details

The article was received on 24 Feb 2017, accepted on 18 Apr 2017 and first published on 25 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA01701D
Citation: J. Mater. Chem. A, 2017,5, 10398-10405
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    Achieving ultralong life sodium storage in amorphous cobalt–tin binary sulfide nanoboxes sheathed in N-doped carbon

    X. Liu, Y. Wang, Z. Wang, T. Zhou, M. Yu, L. Xiu and J. Qiu, J. Mater. Chem. A, 2017, 5, 10398
    DOI: 10.1039/C7TA01701D

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