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Citation: ZHONG Sheng-Kui, YIN Zhou-Lan, WANG Zhi-Xing, CHEN Qi-Yuan. Preparation and Characterization of LiVPO₄F for Cathode Material for Lithium-ion Batteries[J]. Chinese Journal of Applied Chemistry, ;2007, 24(3): 278-281. shu

Preparation and Characterization of LiVPO₄F for Cathode Material for Lithium-ion Batteries

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a College of Chemistry and Chemical Engineering, Central South University, Changsha 410083;
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b Department of Material and Chemistry, Guilin University of Technology, Guilin 541004;
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c School of Metallurgical Science and Engineering, Central South University, Changsha

Corresponding author: ZHONG Sheng-Kui,
Received Date: 8 April 2006
Available Online: 30 July 2006
Fund Project: 国家自然科学基金(50302016)资助项目 (50302016)

LiVPO₄F was prepared with a two-step reaction method based on a carbothermal reduction(CTR) process. In the initial CTR step, V₂O₅, NH₄H₂PO₄, and carbon with a high surface area reacted under an inert atmosphere to yield the trivalent vanadium phosphate, VPO₄. In the second incorporation step, the CTR VPO₄ reacted with LiF to yield the single phase LiVPO₄F. The effect of reaction temperature on the structure and the electrochemical properties were investigated. The results show that the sample synthesized at 750℃ has a single phase LiVPO₄F. XRD studies show that LiVPO₄F synthesized has a triclinic structure(space group P1), isostructural with the naturally occurring mineral tavorite, LiFePO₄·OH. The crystallographic parameters of the prepared LiVPO₄F powders are as follows, a=0.514 9 nm, b=0.529 2 nm, c=0.744 5 nm, α=67.397°, β=67.518°, γ=82.008°, and cell volume=0.173 0 nm³. SEM image showed that the particle size was about 2 μm with homogenous distribution. Electrochemical test shows that the initial charge and discharge capacity were about 149 mA·h/g and 130 mA·h/g, respectively at a rate of 0.1C, with an average discharge voltage of 4.2 V(vs.Li/Li⁺), and the capacity retain 111 mA·h/g after 50 cycles.
- lithium ion battery,
- cathode material,
- LiVPO₄F,
- carbothermal reduction method
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Preparation and Characterization of LiVPO₄F for Cathode Material for Lithium-ion Batteries