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Extraordinary Lithium Ions Storage Capabilities Achieved by SnO2 Nanocrystals Exposed of {221} Facets

Abstract

Rational design of SnO2 nanomaterials with superior architectures and excellent electrochemical properties are highly desirable for lithium ions storage. Here, several SnO2 nanoparticles exposed of different crystal planes such as {101}, {110} and {221} facets have been developed and are further embedded into graphene / carbon nanotubes (G/CNT) networks, achieving the preparation of highly conductive carbon / SnO2 films (C/SnO2) with homogeneous dispersion of SnO2 nanoparticles. Three dimensional (3D) G/CNT networks with highly porous structures and electronic contact with imbedded SnO2 nanoparticles can provide excellent pathways for the transfer of electrons and ions, and further buffer the structural change of SnO2 nanocrystals during the insertion / extraction process of lithium ions. Tight contact between G/CNT matrix and the embedded SnO2 nanoparticles ensures that all the high-energy {221} facets of the SnO2 can be exploited during the rapid electrochemical reactions. And the high electrical conductivity of the G/CNT networks can further prevent the pulverization of the nanostructured SnO2. As a result, C/SnO2 film with 90% content of octahedral SnO2 nanocrystals (C/SnO2-O (90%)) exhibits a superior reversible specific capacity of 1008 mAh/g at 0.1 A/g, an excellent rate capability, low internal resistance and a long-term cycling stability for 1000 cycles. These results further confirm that SnO2 nanocrystals with high-energy {221} facets can provide much more active sites than other SnO2 nanomaterials for lithium ions storage.

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Publication details

The article was received on 03 Jun 2018, accepted on 08 Aug 2018 and first published on 08 Aug 2018


Article type: Paper
DOI: 10.1039/C8NR04513E
Citation: Nanoscale, 2018, Accepted Manuscript
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    Extraordinary Lithium Ions Storage Capabilities Achieved by SnO2 Nanocrystals Exposed of {221} Facets

    B. Li, Y. Yan, C. Shen, Y. Yu, Q. Wang and M. Liu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR04513E

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