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Acta Physico-Chimica Sinica  2011, Vol. 27 Issue (03): 609-614    DOI: 10.3866/PKU.WHXB20110241
ELECTROCHEMISTRY AND NEW ENERGY     
Synthesis and Properties of Spindle-Shaped LiFePO4 for the Cathode Material of Lithium Ion Battery
SU Chang, LU Guo-Qiang, XU Li-Huan, ZHANG Cheng, MA Chun-An
State Key Laboratory Breeding Base for Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, P. R. China
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Abstract  

We synthesized LiFePO4 directly by a solvothermal method at low temperature and then a heat treatment was carried out to give a LiFePO4/C composite for using as a cathode in lithium ion battery. The crystal structure and the charge-discharge performance of the prepared samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and galvanostatic charge-discharge testing. The results indicated that the LiFePO4 synthesized at low-temperature (120 °C) with glycerol as a solvent had a single olivine-type crystal structure and a spindle-shaped morphology with a very narrow size distribution. After heat treatment, a LiFePO4/C composite with excellent charge-discharge performance was obtained and the spindle morphology of the sample was intact. Galvanostatic charge-discharge tests showed that the prepared LiFePO4/C cathode had an initial discharge specific capacity of 147.2 mAh·g-1 at 0.1C at room temperature and it was 136.3 mAh·g-1 after 50 cycles. The average discharge specific capacities of LiFePO4/C at 0.2C, 0.5C, and 1C were about 130, 120, and 108 mAh·g-1, respectively.



Key wordsLithium ion battery      LiFePO4      Spindle-shaped      Solvothermal method      Charge-discharge performance     
Received: 18 October 2010      Published: 18 January 2011
MSC2000:  O646  
Fund:  

The project was supported by the National Natural Science Foundation of China (51003095) and Research on Public Welfare Technology Application Projects of Zhejiang Province, China (2010C31121).

Corresponding Authors: ZHANG Cheng     E-mail: czhang@zjut.edu.cn
Cite this article:

SU Chang, LU Guo-Qiang, XU Li-Huan, ZHANG Cheng, MA Chun-An. Synthesis and Properties of Spindle-Shaped LiFePO4 for the Cathode Material of Lithium Ion Battery. Acta Physico-Chimica Sinica, 2011, 27(03): 609-614.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20110241     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2011/V27/I03/609

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