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Issue 16, 2016
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Polypyrrole-promoted superior cyclability and rate capability of NaxFe[Fe(CN)6] cathodes for sodium-ion batteries

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Abstract

Sodium iron hexacyanoferrate (Fe-HCF) is a potential cathode material for sodium-ion batteries. However, the side reactions in the NaClO4 electrolyte in the charge process over 4.1 V result in structural collapse and low coulombic efficiency during cycling. In this work, we prepared high-quality Fe-HCF microcubes with a size distribution of ∼2 μm and employed conductive polypyrrole (PPy) to wrap the microcubes to form a Fe-HCF@PPy composite. With the coating of PPy, the composite exhibits a discharge capacity of 113.0 mA h g−1 at a current density of 25 mA g−1 and 75 mA h g−1 at 3000 mA g−1. A greatly improved cycling stability is attained with 79% capacity retention over 500 cycles at 200 mA g−1. The superior rate capability and excellent cyclability can be ascribed to the effects from PPy as both an electronic conductor to enhance the conductivity and a protective layer to prevent the side reactions.

Graphical abstract: Polypyrrole-promoted superior cyclability and rate capability of NaxFe[Fe(CN)6] cathodes for sodium-ion batteries

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Publication details

The article was received on 29 Jan 2016, accepted on 21 Mar 2016 and first published on 22 Mar 2016


Article type: Paper
DOI: 10.1039/C6TA00876C
Citation: J. Mater. Chem. A, 2016,4, 6036-6041
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    Polypyrrole-promoted superior cyclability and rate capability of NaxFe[Fe(CN)6] cathodes for sodium-ion batteries

    Y. Tang, W. Zhang, L. Xue, X. Ding, T. Wang, X. Liu, J. Liu, X. Li and Y. Huang, J. Mater. Chem. A, 2016, 4, 6036
    DOI: 10.1039/C6TA00876C

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