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Issue 17, 2018
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Hierarchical assembly and superior sodium storage properties of a sea-sponge structured C/SnS@C nanocomposite

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Abstract

The exploration of electrode materials with superior rate capability and cyclability has been a critical challenge for sodium-ion batteries (SIBs). Herein, a new sea-sponge structured C/SnS@C nanocomposite has been fabricated through the hierarchical assembly of SnS2 nanoflakes on sea-sponge-like macrochannel-interconnected carbon spheres (S-MCSs) and subsequent carbon coating together with the phase transformation of SnS. A notably enhanced performance is achieved which is attributed to the formation of the sea-sponge-like rigid structure and layered SnS nanoflakes, which facilitate Na+ diffusion at a large current density based on the conductive S-MCS skeleton and carbon coating, thus significantly improving the kinetic process of Na+ insertion/extraction. When applied as an anode material for SIBs, the designed C/SnS@C composite exhibits superior cycling stability. It can endure a current density of 10 A g−1 to complete the charge process in 22 s and deliver a capacity of 370 mA h g−1 at 1 A g−1 after five initial activation processes, with over 84% capacity retention from the 200th to the 2000th cycle, which is equivalent to 0.009% decay per cycle.

Graphical abstract: Hierarchical assembly and superior sodium storage properties of a sea-sponge structured C/SnS@C nanocomposite

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Publication details

The article was received on 14 Feb 2018, accepted on 28 Mar 2018 and first published on 12 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA00833G
Citation: J. Mater. Chem. A, 2018,6, 7631-7638
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    Hierarchical assembly and superior sodium storage properties of a sea-sponge structured C/SnS@C nanocomposite

    S. Chen, K. Xing, J. Wen, M. Wen, Q. Wu and Y. Cui, J. Mater. Chem. A, 2018, 6, 7631
    DOI: 10.1039/C8TA00833G

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