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

Synthesis and Electrochemical Performance of Graphene Modified LiFePO₄ Cathode Materials

1.
College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China

Received Date: 26 July 2011
Available Online: 20 October 2011
Fund Project: 国家重点基础研究发展计划项目(973) (2007CB209703) (973) (2007CB209703) 国家自然科学基金(20873064, 21173120, 21103090) (20873064, 21173120, 21103090) 江苏省普通高校科研创新计划(CXZZ11_0204) (CXZZ11_0204)南京航空航天大学博士学位论文创新与创优基金资助(BCXJ11-10) (BCXJ11-10)

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.
- Lithium iron phosphate,
- Graphene,
- Hydrothermal,
- Li-ion battery
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沈阳化工大学材料科学与工程学院沈阳 110142

Synthesis and Electrochemical Performance of Graphene Modified LiFePO4 Cathode Materials

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通讯作者: 陈斌, bchen63@163.com

Synthesis and Electrochemical Performance of Graphene Modified LiFePO₄ Cathode Materials