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Issue 44, 2018
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Nanoflower-like N-doped C/CoS2 as high-performance anode materials for Na-ion batteries

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Abstract

Novel nanoflower-like N-doped C/CoS2 spheres assembled from 2D wrinkled CoS2 nanosheets were synthesized through a facile one-pot solvothermal method followed by sulfurization. Ascribed to the optimized 3D nanostructure and rational surface engineering, the unique hierarchical structure of the nanoflower-like C/CoS2 composites showed an excellent sodium ion storage capacity accompanied by high specific capacity, superior rate performance and long-term cycling stability. Specifically, the conductive interconnected wrinkled nanosheets create a number of mesoporous structures and thus can greatly release the mechanical stress caused by Na+ insertion/extraction. Besides, it was observed from the experiments that many extra defect vacancies and Na+ storage sites are introduced by the nitrogen doping process. It was also observed that the crosslinked 2D nanosheets can effectively reduce the diffusion lengths of sodium ions and electrons, resulting in an outstanding rate performance (>700 mA h g−1 at 1 A g−1 and 458 mA h g−1 at even 10 A g−1) and extraordinary cycling stability (698 mA h g−1 at 1 A g−1 after 500 cycles). The results provide a facile approach to fabricate promising anode materials for high-performance sodium-ion batteries (SIBs).

Graphical abstract: Nanoflower-like N-doped C/CoS2 as high-performance anode materials for Na-ion batteries

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Publication details

The article was received on 28 Aug 2018, accepted on 11 Oct 2018 and first published on 11 Oct 2018


Article type: Paper
DOI: 10.1039/C8NR06959J
Citation: Nanoscale, 2018,10, 20813-20820
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    Nanoflower-like N-doped C/CoS2 as high-performance anode materials for Na-ion batteries

    Y. Pan, X. Cheng, L. Gong, L. Shi and H. Zhang, Nanoscale, 2018, 10, 20813
    DOI: 10.1039/C8NR06959J

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