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Smart hybridization of Sn2Nb2O7/SnO2@3D carbon nanocomposites with enhanced sodium storage performance through self-buffering effects.
- Source :
- Journal of Materials Chemistry A; 7/1/2017, Vol. 5 Issue 25, p13052-13061, 10p
- Publication Year :
- 2017
-
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 Sn<subscript>2</subscript>Nb<subscript>2</subscript>O<subscript>7</subscript>/SnO<subscript>2</subscript> nanoparticles (≈40 nm) homogeneously anchored on 3D carbon networks (indicated with M-Sn<subscript>2</subscript>Nb<subscript>2</subscript>O<subscript>7</subscript>/SnO<subscript>2</subscript>@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 Na<subscript>x</subscript>Nb<subscript>2</subscript>O<subscript>5</subscript> substrate from Sn<subscript>2</subscript>Nb<subscript>2</subscript>O<subscript>7</subscript> 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<superscript>−1</superscript> at the current density of 100 mA g<superscript>−1</superscript>), outstanding high-rate capability (119 mA h g<superscript>−1</superscript> even at the high current density of 10 A g<superscript>−1</superscript>) and extremely long cycling stability (130 mA h g<superscript>−1</superscript> at the current density of 5.0 A g<superscript>−1</superscript> for 5000 cycles). Such excellent electrochemical performance demonstrates the potential use of the Sn<subscript>2</subscript>Nb<subscript>2</subscript>O<subscript>7</subscript>/SnO<subscript>2</subscript>@3D carbon composite as an anode material for high-performance sodium-ion batteries. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 5
- Issue :
- 25
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 123831379
- Full Text :
- https://doi.org/10.1039/c7ta03021e