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Issue 17, 2018
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Target construction of ultrathin graphitic carbon encapsulated FeS hierarchical microspheres featuring superior low-temperature lithium/sodium storage properties

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Abstract

Although numerous electrode materials based on conversion-reactions have been investigated for lithium/sodium ion batteries (L/SIBs), the low-temperature performance is still a big challenge for their practical application in cold climates. Herein, every individual small FeS sphere wrapped by several graphitic carbon layers in a micro–nano system (FeS@g-C) is designed and explored. The in situ generated FeS@g-C delivers excellent electrochemical performance over a wide temperature range. For instance, the reversible capacity of FeS@g-C can reach 562 mA h g−1 at 0.2 A g−1 for LIBs at −20 °C. And for SIBs, it exhibits a capacity of 311 mA h g−1 at 0.05 A g−1 even when operated at a cryogenic temperature of −25 °C. In addition, when paired with a Na3V2(PO4)2O2F cathode as a full cell for SIBs, it also works well, revealing great application prospects. This good electrochemical performance of the FeS@g-C can be attributed to the short ion-diffusion paths provided by the ultrasmall FeS nanospheres along with the more important g-C coating, which guarantees the high conductivity of FeS@g-C. In addition, the perfectly shaped and porous hierarchical FeS spheres can effectively accommodate the volume variation during electrochemical processes, thus endowing the FeS@g-C with a robust structural stability.

Graphical abstract: Target construction of ultrathin graphitic carbon encapsulated FeS hierarchical microspheres featuring superior low-temperature lithium/sodium storage properties

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Publication details

The article was received on 09 Feb 2018, accepted on 26 Mar 2018 and first published on 28 Mar 2018


Article type: Paper
DOI: 10.1039/C8TA01392F
Citation: J. Mater. Chem. A, 2018,6, 7997-8005
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    Target construction of ultrathin graphitic carbon encapsulated FeS hierarchical microspheres featuring superior low-temperature lithium/sodium storage properties

    H. Fan, H. Li, J. Guo, Y. Zheng, K. Huang, C. Fan, H. Sun, X. Li, X. Wu and J. Zhang, J. Mater. Chem. A, 2018, 6, 7997
    DOI: 10.1039/C8TA01392F

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