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Acta Phys. Chim. Sin.  2012, Vol. 28 Issue (01): 105-110    DOI: 10.3866/PKU.WHXB201228105
ELECTROCHEMISTRY AND NEW ENERGY     
Synthesis and Electrochemical Performance of Graphene Modified LiFePO4 Cathode Materials
XU Ke, SHEN Lai-Fa, MI Chang-Huan, ZHANG Xiao-Gang
College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China
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Abstract  Graphene-modified mesoporous LiFePO4 microsphere composites were synthesized by a hydrothermal method and subsequent annealing. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, and galvanostatic charge-discharge techniques were used to characterize the morphology, structure and electrochemical performance of the resulting composites. The graphene-modified LiFePO4 microspheres exhibited a high discharge capacity of 141 mAh·g-1 at 1C, and 105 mAh·g-1 at 50C, while LiFePO4/C only delivered 137 mAh·g-1 at 1C, 64 mAh·g-1 at 50C in an aqueous electrolyte of 2 mol·L-1 LiNO3. The graphene-modified LiFePO4 exhibited excellent cyclability compared with LiFePO4/C, with a capacity retention of about 83.7% after 60 cycles versus about 70.2% for LiFePO4/C. The improved electrochemical performance is attributed to the formation of a three-dimensional (3D) graphene network.

Key wordsLithium iron phosphate      Graphene      Hydrothermal      Li-ion battery     
Received: 26 July 2011      Published: 20 October 2011
MSC2000:  O646  
Fund:  

The project was supported by the National Key Basic Research Program of China (973) (2007CB209703), National Natural Science Foundation of China (20873064, 21173120, 21103090), Jiangsu Innovation Program for Graduate Education, China (CXZZ11_0204), and Outstanding Doctoral Dissertation in Nanjing University of Aeronautics and Astronautics, China (BCXJ11-10).

Corresponding Authors: ZHANG Xiao-Gang     E-mail: azhangxg@163.com
Cite this article:

XU Ke, SHEN Lai-Fa, MI Chang-Huan, ZHANG Xiao-Gang. Synthesis and Electrochemical Performance of Graphene Modified LiFePO4 Cathode Materials. Acta Phys. Chim. Sin., 2012, 28(01): 105-110.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201228105     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2012/V28/I01/105

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