石墨烯掺杂LiFePO4电极材料的合成及其电化学性能

doi:10.3866/PKU.WHXB201228105

Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (01): 105-110.doi: 10.3866/PKU.WHXB201228105

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles Next Articles

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

Received:2011-07-26 Revised:2011-10-12 Published:2011-12-29
Contact: ZHANG Xiao-Gang E-mail:azhangxg@163.com
Supported by:
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).

Abstract

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 words: Lithium iron phosphate, Graphene, Hydrothermal, Li-ion battery

XU Ke, SHEN Lai-Fa, MI Chang-Huan, ZHANG Xiao-Gang. Synthesis and Electrochemical Performance of Graphene Modified LiFePO₄ Cathode Materials[J]. Acta Phys. -Chim. Sin. 2012, 28(01), 105-110. doi: 10.3866/PKU.WHXB201228105

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