Issue 1, 2013
From the journal:

Journal of Materials Chemistry A

Improvement of the electrochemical performance of carbon-coated LiFePO4 modified with reduced graphene oxide

Bo Wang,ab   Dianlong Wang,*a   Qiuming Wang,a   Tiefeng Liu,a   Chenfeng Guoa  and  Xiusong Zhao*b  

* Corresponding authors

a Harbin Institute of Technology, School of Chemical Engineering and Technology, Xidazhi Street, 150001 Harbin, China
E-mail: wangdianlongwbhit@163.com
Fax: +86 451 86413721
Tel: +86 451 86413751

b The University of Queensland, Faculty of Engineering, Architecture and Information Technology, School of Chemical Engineering, St Lucia, Brisbane, QLD 4072, Australia
E-mail: george.zhao@uq.edu.au
Fax: +61 7 33654199
Tel: +61 7 33469997

Abstract

In this work, carbon-coated LiFePO4 was further modified with reduced graphene oxide (RGO) using an ultrasonic-assisted rheological phase method coupled with carbothermal treatment. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and electrochemical methods were used to characterize the material's properties. The results showed that the composite material consisting of carbon-coated LiFePO4 and RGO sheets possesses a unique and effective three-dimensional “sheet-web” structure. In the structure, the LiFePO4 particle size can be maintained at nanosize to form abundant voids between the nanoparticles while the RGO sheets are significantly beneficial for Li+ diffusion. As a result, the electrochemical properties of the composite material have been greatly improved. A sample with 5 wt% RGO exhibited high specific capacity and superior rate performance with the discharge capacities of 160.4 mA h g−1 at 0.2 C and 115.0 mA h g−1 at 20 C. The sample also showed an excellent cycling stability with only about 10% capacity decay at 10 C after 1000 cycles.

Graphical abstract: Improvement of the electrochemical performance of carbon-coated LiFePO4 modified with reduced graphene oxide

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Article information

DOI
https://doi.org/10.1039/C2TA00106C
Article type
Paper
Submitted
29 Aug 2012
Accepted
29 Oct 2012
First published
30 Oct 2012

J. Mater. Chem. A, 2013,1, 135-144

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Improvement of the electrochemical performance of carbon-coated LiFePO4 modified with reduced graphene oxide

B. Wang, D. Wang, Q. Wang, T. Liu, C. Guo and X. Zhao, J. Mater. Chem. A, 2013, 1, 135 DOI: 10.1039/C2TA00106C

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