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Issue 25, 2014
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High-performance FeSb–TiC–C nanocomposite anodes for sodium-ion batteries

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Antimony-based alloy anodes with a Fe metal support dispersed in a conductive matrix consisting of TiC and carbon have been developed by high energy mechanical milling (HEMM) for sodium-ion batteries. The samples have been characterized by X-ray diffraction before and after sodiation at different C rates and by high-resolution transmission electron microscopy before and after cycling for 100 cycles. Electrochemical charge–discharge cycling at various rates and electrochemical impedance spectroscopy measurements have been carried out with and without 2 vol% of the fluoroethylene carbonate (FEC) additive in the electrolyte. With well-defined crystalline FeSb and TiC structures, the FeSb–TiC–C nanocomposite anodes demonstrate superior rate capability with good capacity retention at 10 000 mA g−1 for sodium-ion storage, which could be ascribed to the novel nanocomposite structure consisting of a good metal (Fe) framework and a combination of conductive TiC and carbon as a matrix. The FEC additive particularly leads to a longer cycle life with high rate capability due to the formation of a stable, thin SEI layer and a smaller charge-transfer resistance.

Graphical abstract: High-performance FeSb–TiC–C nanocomposite anodes for sodium-ion batteries

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Publication details

The article was received on 22 Mar 2014, accepted on 02 May 2014 and first published on 08 May 2014

Article type: Paper
DOI: 10.1039/C4CP01240B
Phys. Chem. Chem. Phys., 2014,16, 12884-12889

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    High-performance FeSb–TiC–C nanocomposite anodes for sodium-ion batteries

    I. T. Kim, E. Allcorn and A. Manthiram, Phys. Chem. Chem. Phys., 2014, 16, 12884
    DOI: 10.1039/C4CP01240B

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