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Acta Physico-Chimica Sinica  2010, Vol. 26 Issue (03): 573-577    DOI: 10.3866/PKU.WHXB20100303
ELECTROCHEMISTRY     
A New Rheological Phase Route to Synthesize Nano-LiVOPO4 Cathode Material for LithiumIon Batteries
XIONG Li-Zhi, HE Ze-Qiang
College of Biology and Environmental Sciences, Jishou University, Jishou 416000, Hunan Province, P. R. China; College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
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Abstract  

A novel lithium-ion battery cathode material, nano-LiVOPO4, was synthesized by a new rheological phase method. The microstructure, surface morphology, and electrochemical properties were characterized by various electrochemicalmethods in combination withX-ray diffraction (XRD) and scanning electron microscopy (SEM). Results show that the orthorhombic LiVOPO4, obtained by this rheological phase method, is made up of 10-60 nm particles. The first discharge capacity, charge capacity, and columbic efficiency of LiVOPO4 were found to be 135.7 mAh·g-1, 145.8 mAh·g-1, and 93.0%, respectively. After 60 cycles, the discharge capacity remained 134.2 mAh·g-1, at 98.9% of the first discharge capacity, and the capacity loss per cycle was only 0.018%at 0.1C (1C=160 mA·g-1).More than 96.5% and 91.6% of the discharge capacity at 0.1C were maintained at 1.0C and 2.0C, respectively. The charge transfer resistance increased with the increase of the cycle number and the diffusion coefficient of lithium ion in the nano-LiVOPO4 was in the order of 10-11 cm2·s-1. Experimental results suggest that the rheological phase method is a good route for the synthesis of LiVOPO4 cathode material of high capacity, good cycling performance, and good current rate capability for lithiumion batteries.



Key wordsLithium ion battery      Rheological phase method      LiVOPO4      Current rate capability      Diffusion coefficient     
Received: 18 October 2009      Published: 13 January 2010
MSC2000:  O646  
Corresponding Authors: HE Ze-Qiang     E-mail: csuhzq@163.com
Cite this article:

XIONG Li-Zhi, HE Ze-Qiang. A New Rheological Phase Route to Synthesize Nano-LiVOPO4 Cathode Material for LithiumIon Batteries. Acta Physico-Chimica Sinica, 2010, 26(03): 573-577.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20100303     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2010/V26/I03/573

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