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Issue 23, 2019
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Yolk–shell N-doped carbon coated FeS2 nanocages as a high-performance anode for sodium-ion batteries

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Abstract

Pyrite FeS2 displays brilliant prospects for sodium storage because of its high theoretical capacity (894 mA h g−1), low cost and eco-friendly properties. The practical application of FeS2, however, has been thwarted by poor cycle life derived from the large volume change and active sulfide loss upon sodiation/desodiation. Herein, we fabricated yolk–shell nitrogen-doped carbon-coated FeS2 nanocages (PFS@NC) by a facile thermal-sulfurization of polypyrrole-coated Prussian blue precursors for sodium-ion batteries. The yolk–shell structure affords enough space to buffer the volumetric change of FeS2 nanoparticles during the sodiation process. Therefore, the structural integrity of PFS@NC can be preserved without deforming the carbon shell. Additionally, the nitrogen-doped carbon not only improves the electronic conductivity of the composite, but also effectively traps the soluble reduced products of FeS2, contributing to its stable cycling performance. As a result, a high specific capacity of 375 mA h g−1 has been achieved up to 1000 cycles at 5 A g−1 (92% capacity retention). The PFS@NC composite could be an excellent anode material for sodium storage and the as-developed synthetic strategy is expected to be utilized for improving the performance of other metal sulfide electrode materials.

Graphical abstract: Yolk–shell N-doped carbon coated FeS2 nanocages as a high-performance anode for sodium-ion batteries

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Publication details

The article was received on 13 Apr 2019, accepted on 07 May 2019 and first published on 08 May 2019


Article type: Paper
DOI: 10.1039/C9TA03917A
J. Mater. Chem. A, 2019,7, 14051-14059

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    Yolk–shell N-doped carbon coated FeS2 nanocages as a high-performance anode for sodium-ion batteries

    R. Zang, P. Li, X. Guo, Z. Man, S. Zhang, C. Wang and G. Wang, J. Mater. Chem. A, 2019, 7, 14051
    DOI: 10.1039/C9TA03917A

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