The synthesis of lithium vanadium phosphate cathode material with high electrochemical performance

ZHANG Changchun; GU Dawei; YIN Pengwei; JIANG Hongying; LI Jishu; SHEN Linjiang

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The synthesis of lithium vanadium phosphate cathode material with high electrochemical performance

ZHANG Changchun,GU Dawei,YIN Pengwei,JIANG Hongying,LI Jishu,SHEN Linjiang *

College of Sciences, Nanjing University of Technology, 211816

*Correspondence author

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Funding: National Natural Science Foundation of China （No.No. 10774076）, Natural Science Foundation of the Jiangsu Higher Education Institutions（No.09KJB140003 and 11KJB480003）, National Laboratory of Solid State Microstructures in Nanjing University（No.M25021）

Opened online:28 April 2013

Accepted by: none

Citation: ZHANG Changchun,GU Dawei,YIN Pengwei.The synthesis of lithium vanadium phosphate cathode material with high electrochemical performance[OL]. [28 April 2013] http://en.paper.edu.cn/en_releasepaper/content/4539479

The VO2 nanorods were prepared with V2O5 by hydrothermal method. Polypyrrole was coated on the surface of VO2 through in-situ polymerization. The VO2 particles coated with polypyrrole were mixed with NH4H2(PO4)3 and Li2CO3 in ethyl alcohol according to the stoichiometry of Li3V2(PO4)3 to synthesize the cathode material Li3V2(PO4)3/C. Polypyrrole coated on the surface of VO2 nanorods was carbonized in the process of calcination to inhibit the growth of Li3V2(PO4)3 grains. A battery was assembled with Li3V2(PO4)3/C (cathode) and lithium metal (anode) to test the electrochemical performance of cathode material. The constant current charge/discharge cycling performance was measured in the potential range of 3.0-4.3 V. The discharge capacities were 130, 125, 123 and 115 mAh g-1 at the rates of 0.2, 1.0, 2.0 and 5.0 C, respectively. And the discharge specific capacity was 121 mAh g-1 after 600 cycles at 1.0 C, meaning the discharge specific capacity retention rate was as high as 96 %. The grain refinement enhances the electrochemical performance of Li3V2(PO4)3/C.

Keywords:Lithium vanadium phosphate; Lithium ion batteries; Electrochemical performance

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