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Issue 17, 2019
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Experimental design and theoretical calculation for sulfur-doped carbon nanofibers as a high performance sodium-ion battery anode

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Abstract

Hard carbon is one of the most promising anode materials for sodium ion batteries (SIBs) due to its low cost, high conductivity and suitable potential; however, its application is hindered by its relatively low capacity, and unsatisfactory rate capability and cyclability. Herein, we have reported a high performance SIB anode of S-doped interconnected carbon nanofibers (denoted as S-CNFs) that was directly derived from the industrial waste product bacterial cellulose, demonstrating great potential for practical application and sustainable development. The S-CNFs present high reversible capacities of 460 mA h g−1 at 0.05 A g−1 and 255 mA h g−1 at 10 A g−1, and preserved a capacity of 310 mA h g−1 at 1 A g−1 after 1100 cycles. Structural and electrochemical analyses revealed that multiple factors including the expanded (002) interlayer spacing, the electrochemically active –C–S–C– covalent bonds, the capacitive process induced by a large surface area and considerable defects as well as the stable structure associated with the cross-linked network contributed to their excellent performance. Furthermore, the first principles evaluations confirmed the sodium-storage mechanism of sulfur doping, which not only improved the interlayer distance for the mobility of Na+ but also promoted the electronegativity as well as the electrochemical activity and increased the adsorption of Na+.

Graphical abstract: Experimental design and theoretical calculation for sulfur-doped carbon nanofibers as a high performance sodium-ion battery anode

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Publication details

The article was received on 25 Feb 2019, accepted on 29 Mar 2019 and first published on 29 Mar 2019


Article type: Communication
DOI: 10.1039/C9TA02107H
Citation: J. Mater. Chem. A, 2019,7, 10239-10245

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    Experimental design and theoretical calculation for sulfur-doped carbon nanofibers as a high performance sodium-ion battery anode

    Q. Jin, W. Li, K. Wang, P. Feng, H. Li, T. Gu, M. Zhou, W. Wang, S. Cheng and K. Jiang, J. Mater. Chem. A, 2019, 7, 10239
    DOI: 10.1039/C9TA02107H

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