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Issue 22, 2016
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Synergistic sodiation of cobalt oxide nanoparticles and conductive carbon nanotubes (CNTs) for sodium-ion batteries

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Abstract

Replacing lithium with sodium-ion batteries for energy storage is of enormous interest, especially from practical and economic considerations. However, it has proved difficult to achieve competitive figures of merit for sodium-ion batteries due to the lack of a detailed understanding of the reaction mechanism(s). Herein, we report a sodium electrochemical conversion reaction with Co3O4 nanoparticles decorated on carbon nanotubes (Co3O4/CNTs) utilizing in situ TEM, down to the atomic-scale. We observe synergetic effects of the two nanoscale components, which provide insights into a new sodiation mechanism, facilitated by Na-diffusion along a CNT backbone and CNT–Co3O4 interfaces. A thin layer of amorphous low conductivity Na2O forms on the CNT surfaces at the beginning of sodiation. The conversion reaction results in the formation of ultrafine metallic Co nanoparticles and polycrystalline Na2O, and fast diffusion of the reaction products which might be due to the quick migration of Na2O under an electron beam. In the desodiation process, the dissociation of Na2O and formation of Co3O4 due to the de-conversion reaction are observed.

Graphical abstract: Synergistic sodiation of cobalt oxide nanoparticles and conductive carbon nanotubes (CNTs) for sodium-ion batteries

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Publication details

The article was received on 09 Mar 2016, accepted on 08 May 2016 and first published on 09 May 2016


Article type: Paper
DOI: 10.1039/C6TA02051H
Citation: J. Mater. Chem. A, 2016,4, 8669-8675
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    Synergistic sodiation of cobalt oxide nanoparticles and conductive carbon nanotubes (CNTs) for sodium-ion batteries

    Q. Li, J. Wu, J. Xu and V. P. Dravid, J. Mater. Chem. A, 2016, 4, 8669
    DOI: 10.1039/C6TA02051H

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