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Synthesis of long hierarchical MoS2 nanofibers assembled from nanosheets with expanded interlayer distance for achieving superb Na-ion storage performance

Abstract

MoS2 material is considered as a promising anode material candidate in Na-ion batteries (NIBs) due to its high theoretical capacity and layered structure. However, MoS2 nanosheets usually tend to restacked or aggregated during synthesis and cycling process, which make the advantages belonged to the separated nanosheets disappear. Here, we present a PVP-assisted synthesis for growing long hierarchical MoS2 nanofibers with length up to 74.5 μm, which was further assembled from intercrossed curly nanosheets with expanded (002) interlayer spacings in the range of 0.62 nm to 1.14 nm. Such architecture design simultaneously combines multiple-scale structure features that desired for Na-ion storage. On the one side, the nanosheets can provide large surface area contacted with electrolyte, short Na-ion diffusion pathway from the laterel side and facile Na-ion insertion and extraction through expanded (002) interlayer; On the other side, the hierarchical MoS2 nanofibers possess one dimensional structure and a suitable amount of carbon, which can both serve as an electrical highway and prevent them from restacking, resulting in an enhanced elctrochemical performance. When used as anode in NIBs, they demonstrated excellent cycling performance (537 mAh g−1 at 0.1 A g−1 after 200 cycles, and 370 mAh g−1 at 2 A g−1 over 200 cycles) and outstanding rate capability (329 mAh g−1 at 10 A g−1).

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Publication details

The article was accepted on 11 Sep 2017 and first published on 13 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR06021A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Synthesis of long hierarchical MoS2 nanofibers assembled from nanosheets with expanded interlayer distance for achieving superb Na-ion storage performance

    Z. Gao, X. Yu, J. Zhao, W. Zhao, R. Xu, Y. Liu and H. Shen, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06021A

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