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Smart hybridization of Sn2Nb2O7/SnO2@3D carbon nanocomposites with enhanced sodium storage performance through self-buffering effects

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Abstract

Proper hybridization of different kinds of materials into tailored structures is a highly effective way to fabricate advanced anode materials for sodium ion batteries. In this work, mulberry-like Sn2Nb2O7/SnO2 nanoparticles (≈40 nm) homogeneously anchored on 3D carbon networks (indicated with M-Sn2Nb2O7/SnO2@3DC) were prepared through a facile one-step high temperature calcination technique. In the constructed architecture, Sn-based materials with high specific capacity, Nb-based materials with excellent structural stability and 3D carbon networks with high electron conductivity were well integrated into a smart system. The 3D carbon networks not only act as a buffer material to prevent pulverization, but also serve as a conductive matrix, while the in situ formed amorphous NaxNb2O5 substrate from Sn2Nb2O7 can restrain the volume variation to prevent Sn from aggregation and pulverization during cycling. This unique “self-buffering” effect can remarkably enhance the structural integrity of the electrode. As a result, when tested as a sodium ion battery anode, the as-synthesized hybrid exhibited relatively high reversible capacity (300 mA h g−1 at the current density of 100 mA g−1), outstanding high-rate capability (119 mA h g−1 even at the high current density of 10 A g−1) and extremely long cycling stability (130 mA h g−1 at the current density of 5.0 A g−1 for 5000 cycles). Such excellent electrochemical performance demonstrates the potential use of the Sn2Nb2O7/SnO2@3D carbon composite as an anode material for high-performance sodium-ion batteries.

Graphical abstract: Smart hybridization of Sn2Nb2O7/SnO2@3D carbon nanocomposites with enhanced sodium storage performance through self-buffering effects

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Publication details

The article was received on 07 Apr 2017, accepted on 31 May 2017 and first published on 31 May 2017


Article type: Paper
DOI: 10.1039/C7TA03021E
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Smart hybridization of Sn2Nb2O7/SnO2@3D carbon nanocomposites with enhanced sodium storage performance through self-buffering effects

    P. Zhai, J. Qin, L. Guo, N. Zhao, C. Shi, E. Liu, F. He, L. Ma, J. Li and C. He, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA03021E

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