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

Wang, Bo, Wang, Dianlong, Wang, Qiuming, Liu, Tiefeng, Guo, Chenfeng and Zhao, Xiusong (2013) Improvement of the electrochemical performance of carbon-coated LiFePO4 modified with reduced graphene oxide. Journal of Materials Chemistry A, 1 1: 135-144. doi:10.1039/c2ta00106c

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Author Wang, Bo
Wang, Dianlong
Wang, Qiuming
Liu, Tiefeng
Guo, Chenfeng
Zhao, Xiusong
Title Improvement of the electrochemical performance of carbon-coated LiFePO4 modified with reduced graphene oxide
Journal name Journal of Materials Chemistry A   Check publisher's open access policy
ISSN 2050-7488
2050-7496
Publication date 2013-01
Year available 2012
Sub-type Article (original research)
DOI 10.1039/c2ta00106c
Open Access Status Not Open Access
Volume 1
Issue 1
Start page 135
End page 144
Total pages 10
Place of publication Cambridge, United Kingdom
Publisher R S C
Collection year 2013
Language eng
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.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes First published online: 30 October 2012.

 
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