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Ultrafine Co1-xS Nanoparticles Embedded in Nitrogen Doped Porous Carbon Hollow Nanosphere Composite as Anode for Superb Sodium-Ion Batteries and Lithium Ion Batteries

Abstract

Cobalt sulfides have attracted increasing attention as intriguing candidates as anodes for SIBs and LIBs owing to their unique chemical and physical properties. In this work, a precursor of Co1-xS with uniform and hollow nanospherical architecture is obtained with 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 external amorphous carbon layer) are selectively fabricated via directly calcination or PPy coating & calcination of the obtained precursor. It is found that the former shows the best electrochemical performance than the latter two materials as anodes for sodium ion batteries (SIBs). Beside the excellent rate performance, a high reversible discharge capacity of 320 mAg-1 can be remained after 130 cycles at 1 A g-1. The enhanced cycle performances may be attributed to its unique structure, higher conductivity and more active sites. In addition, 559 mA h gāˆ’1 is maintained after 100 cycles at 500 mA gāˆ’1 when the Co1-xS/C composite applied as anode for lithium-ion batteries (LIBs). The high reversible capacity, excellent cycle stability combined with the facile synthesis procedure enable Co1-xS/C a prospective anode material for rechargeable 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, Accepted Manuscript
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    Ultrafine Co1-xS Nanoparticles Embedded in Nitrogen Doped Porous Carbon Hollow Nanosphere Composite as Anode for Superb Sodium-Ion Batteries and Lithium Ion Batteries

    C. Dong, L. Guo, Y. He, L. Shang, Y. Q. Qian and L. Xu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C7NR07882J

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