Capacitance-enhanced Sodium-ion Storage In Nitrogen-rich Hard ...

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Journal of Materials Chemistry A

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

Rohit Ranganathan Gaddam,a Amir H. Farokh Niaei,b Marlies Hankel, b Debra J. Searles, bc Nanjundan Ashok Kumar *a and X. S. Zhao *a Author affiliations

* Corresponding authors

a School of Chemical Engineering, The University of Queensland, St Lucia, Brisbane 4072, Australia E-mail: [email protected], [email protected]

b Centre for Theoretical and Computational Molecular Science, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, Australia

c School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia

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.

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Article information

DOI https://doi.org/10.1039/C7TA06754B Article type Paper Submitted 01 Aug 2017 Accepted 25 Sep 2017 First published 25 Sep 2017

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J. Mater. Chem. A, 2017,5, 22186-22192 BibTex EndNote MEDLINE ProCite ReferenceManager RefWorks RIS

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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, 5, 22186 DOI: 10.1039/C7TA06754B

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Rohit Ranganathan Gaddam Amir H. Farokh Niaei Marlies Hankel Debra J. Searles Nanjundan Ashok Kumar X. S. Zhao

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