Issue 109, 2015

Effects of functional groups of graphene oxide on the electrochemical performance of lithium-ion batteries

Abstract

Graphene oxide (GO) with different ratios of functional groups are prepared via low temperature direct thermal reduction technology and re-oxidization by nitric acid, respectively. The structural, elemental, and oxygen-containing functional group compositions and electrochemical behaviors of the prepared GO are characterized using Fourier infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, Raman spectroscopy, and X-ray photoelectron spectroscopy, as well as charge/discharge curves and electrochemical impedance spectra measurements. Compared with graphite and graphene, the enhanced reversible capacity of GO is attributed to the oxygen-containing functional groups and the improved capacities are attributed predominantly to carbonyl and carboxyl groups. Besides, labile oxygen functionalities, such as epoxy groups, have a negative effect on the electrochemical properties, which lower the initial coulomb efficiency of graphene oxide anode materials. These findings may be beneficial to the material design of graphene-based anode materials with a high energy density.

Graphical abstract: Effects of functional groups of graphene oxide on the electrochemical performance of lithium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
02 Sep 2015
Accepted
06 Oct 2015
First published
07 Oct 2015

RSC Adv., 2015,5, 90041-90048

Author version available

Effects of functional groups of graphene oxide on the electrochemical performance of lithium-ion batteries

Z. Xie, Z. Yu, W. Fan, G. Peng and M. Qu, RSC Adv., 2015, 5, 90041 DOI: 10.1039/C5RA17854A

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