Issue 31, 2013
From the journal:

Physical Chemistry Chemical Physics

Na3V2O2(PO4)2F/graphene sandwich structure for high-performance cathode of a sodium-ion battery

Maowen Xu,ab   Long Wang,a   Xin Zhao,a   Jie Song,a   Hui Xie,a   Yuhao Lua  and  John B. Goodenough*a  

* Corresponding authors

a Texas Materials Institute, University of Texas at Austin, Texas 78712, USA
E-mail: jgoodenough@mail.utexas.edu
Fax: +01-512-471-7681
Tel: +01-512-471-1646

b Institute for Clean Energy & Advanced Materials, Southwest University, Chongqing 400715, P. R. China

Abstract

A Na3V2O2(PO4)2F/reduced-graphene-oxide (RGO) sandwich structure has been synthesized by a facile one-step solvothermal method. Cubic Na3V2O2(PO4)2F nanoparticles are homogeneously trapped between conductive RGO sheets during its growth and assembled into a compact sandwich structure, which allows the electrically insulating Na3V2O2(PO4)2F nanoparticles to be wired up to a current collector through the underlying graphene conducting layers. As a sodium-insertion cathode material, the structure exhibits a high reversible capacity of 120 mA h g−1 at a discharge rate of C/20 with a capacity retention of 100.4 mA h g−1 at 1 C and an excellent cyclic retention of 91.4% after the 200th cycle at C/10. These results highlight the importance of anchoring Na3V2O2(PO4)2F on a conducting scaffold for maximum utilization of the electrochemically active Na3V2O2(PO4)2F particles in a high-performance sodium-ion battery.

Graphical abstract: Na3V2O2(PO4)2F/graphene sandwich structure for high-performance cathode of a sodium-ion battery

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Article information

DOI
https://doi.org/10.1039/C3CP52408F
Article type
Paper
Submitted
10 Jun 2013
Accepted
18 Jun 2013
First published
19 Jun 2013

Phys. Chem. Chem. Phys., 2013,15, 13032-13037

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Na3V2O2(PO4)2F/graphene sandwich structure for high-performance cathode of a sodium-ion battery

M. Xu, L. Wang, X. Zhao, J. Song, H. Xie, Y. Lu and J. B. Goodenough, Phys. Chem. Chem. Phys., 2013, 15, 13032 DOI: 10.1039/C3CP52408F

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