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Capacitance-enhanced sodium-ion storage in nitrogen-rich hard carbon

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Abstract

We demonstrate an approach to prepare nitrogen-rich hard carbon (N-HCS) from biomass as a robust anode material for sodium-ion batteries. A reversible capacity of ∼520 mA h g−1 at a current density of 20 mA g−1 along with an excellent rate performance was obtained. When cycled at a high current density of 1 A g−1, the N-HCS was stable for over 1000 cycles delivering a capacity of ∼204 mA h g−1. Density functional theory (DFT) computations verified that nitrogen doping enhances the interaction of sodium ions with the carbon, leading to a significantly improved storage capacity. This work provides new physical insights into the relationship between sodium-ion storage and nitrogen-containing hard carbon materials.

Graphical abstract: Capacitance-enhanced sodium-ion storage in nitrogen-rich hard carbon

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Publication details

The article was received on 01 Aug 2017, accepted on 25 Sep 2017 and first published on 25 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA06754B
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Capacitance-enhanced sodium-ion storage in nitrogen-rich hard carbon

    R. R. Gaddam, A. H. Farokh Niaei, M. Hankel, D. J. Searles, N. A. Kumar and X. S. Zhao, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA06754B

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