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Sandwiched spherical tin dioxide/graphene with a three-dimensional interconnected closed pore structure for lithium storage

Abstract

Low reversion of lithium oxide and the tin coarsening caused irreversible capacity loss is the main reason for the poor cycle performance in tin dioxide-based composites. Herein, a novel sandwiched spherical tin dioxide/graphene with a three-dimensional interconnected closed pore structure is synthesized. The microstructural characterization shows that the spherical graphene in submicron diameter interconnects each other forming an interconnected flexible conductive network, while a large number of SnO2 nanoparticles (ca. 5 nm) are limited homogeneously in the interlayer of the sphere-like graphene shell. The sandwich structure of SnO2/graphene and the closed graphene sphere can provide double protection to SnO2. When it’s used as anode material for energy storage, the generated Li2O can keep in close contact with Sn to make the conversion reaction (SnO2 + 4Li+ + 2e− ↔ Sn + Li2O) highly reversible in situ and the reversibility even doesn’t diminish distinctly after 100 cycles. A high reversible specific capacity of 914.8 mAh g−1 is expressed in the sandwiched spherical SnO2/graphene composite at 100 mA g‒1 after 100 cycles, which is significantly higher than that of SnO2/graphene aerogel with opening pore structure.

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Publication details

The article was received on 10 May 2018, accepted on 02 Aug 2018 and first published on 03 Aug 2018


Article type: Paper
DOI: 10.1039/C8NR03776K
Citation: Nanoscale, 2018, Accepted Manuscript
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    Sandwiched spherical tin dioxide/graphene with a three-dimensional interconnected closed pore structure for lithium storage

    B. Zhao, Z. X. Wang, S. Wang, J. L. Jiang, J. Si, S. Huang, Z. Chen, W. Li and Y. Jiang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR03776K

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