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Issue 16, 2018
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CoS2 nanodots trapped within graphitic structured N-doped carbon spheres with efficient performances for lithium storage

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Abstract

Cobalt sulfide (CoS2)-based nanomaterials are promising electrode materials for various energy storage and conversion applications due to their large specific capacities and catalytic activities. However, CoS2-based nanomaterials are still suffering from their volume expansion, agglomeration and poor cycling stability. Here, we demonstrated an intriguing and effective strategy to confine CoS2 nanodots (<10 nm) within the graphitic carbon walls of porous N-doped carbon spheres (CoS2-in-wall-NCSs), which both avoids the volume change and facilitates the promotion of reaction kinetics in lithium ion batteries (LIBs). Moreover, N-doped carbon spheres (NCSs) with nest-like architectures and graphitic carbon nanoribbons offer an ideal diffusion pathway for electrolyte ions and a highly rapid electron transfer pathway. As a result, the CoS2-in-wall-NCSs still exhibit an excellent performance in LIBs with a high specific capacity of 1080.6 mA h g−1 at a current density of 200 mA g−1 even after 500 cycles, which is much better than those of CoS2 nanoparticles (NPs) in the pores of N-doped carbon spheres (CoS2-in-pore-NCSs), metallic Co NPs embedded in N-doped carbon spheres (Co/NCSs), and NCSs. Even at a current density as high as 1000 mA g−1, a reversible capacity of 735.5 mA h g−1 is obtained for CoS2-in-wall-NCSs.

Graphical abstract: CoS2 nanodots trapped within graphitic structured N-doped carbon spheres with efficient performances for lithium storage

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Publication details

The article was received on 22 Jan 2018, accepted on 21 Mar 2018 and first published on 22 Mar 2018


Article type: Paper
DOI: 10.1039/C8TA00689J
Citation: J. Mater. Chem. A, 2018,6, 7148-7154
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    CoS2 nanodots trapped within graphitic structured N-doped carbon spheres with efficient performances for lithium storage

    H. Xia, K. Li, Y. Guo, J. Guo, Q. Xu and J. Zhang, J. Mater. Chem. A, 2018, 6, 7148
    DOI: 10.1039/C8TA00689J

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