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Issue 6, 2018
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Ultrafine Co1−xS nanoparticles embedded in a nitrogen-doped porous carbon hollow nanosphere composite as an anode for superb sodium-ion batteries and lithium-ion batteries

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Abstract

Cobalt sulfides are attractive as intriguing candidates for anodes in SIBs and LIBs owing to their unique chemical and physical properties. In this study, a precursor of Co1−xS with a uniform and hollow nanospherical architecture is obtained with a high yield via a mild solvothermal method in the presence of 2-methylimidazole at first. Then, Co1−xS, Co1−xS/C (ultrafine Co1−xS nanoparticles embedded in the shells of the nitrogen-doped porous carbon hollow nanosphere), and Co1−xS@C (Co1−xS nanoparticles entirely covered by an external amorphous carbon layer) were selectively fabricated via direct calcination or PPy coating & calcination of the obtained precursor. Co1−xS/C shows best electrochemical performance than the other two materials as anodes for sodium-ion batteries (SIBs). Besides the excellent rate performance, a high reversible discharge capacity of 320 mA g−1 can be retained after 130 cycles at 1 A g−1. The impressive performance may be attributed to the unique structure, higher conductivity, and more active sites of Co1−xS/C. In addition, 559 mA h g−1 was maintained after 100 cycles at 500 mA g−1 when the Co1−xS/C composite was applied as an anode in lithium-ion batteries (LIBs). The high reversible capacity, excellent cycle stability combined with the facile synthesis procedure render Co1−xS/C a prospective anode material for rechargeable batteries.

Graphical abstract: Ultrafine Co1−xS nanoparticles embedded in a nitrogen-doped porous carbon hollow nanosphere composite as an anode for superb sodium-ion batteries and lithium-ion batteries

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Publication details

The article was received on 23 Oct 2017, accepted on 04 Jan 2018 and first published on 04 Jan 2018


Article type: Paper
DOI: 10.1039/C7NR07882J
Citation: Nanoscale, 2018,10, 2804-2811
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    Ultrafine Co1−xS nanoparticles embedded in a nitrogen-doped porous carbon hollow nanosphere composite as an anode for superb sodium-ion batteries and lithium-ion batteries

    C. Dong, L. Guo, Y. He, L. Shang, Y. Qian and L. Xu, Nanoscale, 2018, 10, 2804
    DOI: 10.1039/C7NR07882J

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