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SCIENCE CHINA Materials, Volume 61, Issue 12: 1527-1535(2018) https://doi.org/10.1007/s40843-018-9324-0

Two-dimensional SnO2/graphene heterostructures for highly reversible electrochemical lithium storage

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  • ReceivedJun 7, 2018
  • AcceptedJul 12, 2018
  • PublishedAug 17, 2018

Abstract

The ever-growing market demands for lithium ion batteries have stimulated numerous research efforts aiming at the exploration of novel electrode materials with higher capacity and long-term cycling stability. Two-dimensional (2D) nanomaterials and their heterostructures are an intense area of study and promise great potential in electrochemical lithium storage owing to their unique properties that result from structural planar confinement. Here we report a microwave chemistry strategy to integrate ultrathin SnO2 nanosheets into graphene layer to construct surface-to-surface 2D heterostructured architectures, which can provide unique structural planar confinement for highly reversible electrochemical lithium storage. The as-synthesized 2D SnO2/graphene heterostructures can exhibit high reversible capacity of 688.5 mA h g−1 over 500 cycles with excellent long-term cycling stability and good rate capability when used as anode materials for lithium ion batteries. The present work definitely reveals the advantages of 2D heterostructures featured with a surface-to-surface stack between two different nanosheets in energy storage and conversion devices.


Funded by

China Ministry of Science and Technology under Contract of 2016YFA(0202801)

the National Natural Science Foundation of China(21521091,21390393,U1463202,21471089,21671117,21703219,21371023)

and China Postdoctoral Science Foundation(2017M620738)


Acknowledgment

This work was supported by China Ministry of Science and Technology under Contract of 2016YFA (0202801), the National Natural Science Foundation of China (21521091, 21390393, U1463202, 21471089, 21671117, 21703219 and 21371023), and China Postdoctoral Science Foundation (2017M620738).


Interest statement

The authors declare no conflict of interest.


Contributions statement

Zhu Y conceived the idea, proposed the strategy, designed and performed the experiment, analyzed the results and wrote the manuscript. Cao T and Li Z helped with the HR-TEM, STEM and EDX elemental mapping characterizations. Chen C, Peng Q, and Wang D helped with data analyses and discussions. Wang D and Li Y supervised the project, helped design the experiments, evaluated the data and wrote the manuscript.


Author information

Youqi Zhu received his PhD degree in 2016 at Beijing Institute of Technology. Since then, he did postdoctoral work with Prof. Yadong Li at Tsinghua University. His research interests focus on the design, preparation, and application of the ultrathin two-dimensional nanomaterials in energy storage and conversion and heterogeneous catalysis.


Dingsheng Wang received his BSc degree from the Department of Chemistry and Physics, University of Science and Technology of China in 2004, and his PhD degree from the Department of Chemistry, Tsinghua University in 2009, under the supervision of Prof. Yadong Li. He did his postdoctoral research at the Department of Physics, Tsinghua University, with Prof. Shoushan Fan. He joined the faculty of the Department of Chemistry, Tsinghua University in 2012.


Supplement

Supplementary information

Supporting data are available in the online version of the paper.


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  • Figure 1

    Schematic illustration of the fabrication of 2D SnO2/graphene heterostructures.

  • Figure 2

    Chemical composition and physical characterizations of 2D SnO2/graphene heterostructures: (a) XRD patterns of 2D SnO2/graphene heterostructures (HS) and SnO2 nanosheets (NS). (b) Thermogravimetric curve. (c) Raman spectra. (d) N2 adsorption-desorption isotherm. (e) Survey XPS spectrum. (f) High-resolution Sn 3d spectrum of 2D SnO2/graphene heterostructures (I) and SnO2 nanosheets (II).

  • Figure 3

    Morphology and microstructure characterizations of 2D SnO2/graphene heterostructures: (a) typical field emission scanning electron microscopy (FESEM) image of pristine graphene for comparison. (b–e) FESEM images at different magnifications. (f) TEM image. (g) HRTEM image. (h) Selected area electron diffraction (SAED). (i, j) Scanning transmission electron microscopy (STEM) image and corresponding EDS mapping.

  • Figure 4

    Electrochemical lithium storage performances of 2D SnO2/graphene heterostructures: (a) typical CV curves at a scan rate of 0.1 mV s−1. (b) The first five galvanostatic charge−discharge profiles. (c) Rate capability at different current density. (d) Nyquist plots and the equivalent electrical circuit (inset). (e) Cycling performance at 200 mA g−1.

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