High-rate characteristic of F-substitution cathode materials for Li–ion batteries |
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| Authors: | Shengkui Zhong Letong Liu Jiequn Liu Jian Wang Jianwen Yang |
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| Affiliation: | aDepartment of Materials and Chemical and Engineering, Guilin University of Technology, Guilin, 541004, China;bKey Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, Guilin University of Technology, Guilin, 541004, China |
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| Abstract: | ![]()
The effect of fluorine substitution on the electrochemical properties of Li3V 2(PO4)3 cathode materials was studied. Samples with stoichiometric proportions of Li3V 2(PO4)3−xFx (x=0,0.05,0.10,0.15) were prepared by adding LiF in the starting materials of Li3V 2(PO4)3. XRD studies showed that the F-substituted Li3V 2(PO4)3 had the same monoclinic structure as the un-substituted Li3V 2(PO4)3. SEM images showed that F-substitution Li3V 2(PO4)3 had a regular and uniform particles. The results of electrochemical measurement showed that F-substitution can improve the rate capability of these cathode materials. The Li3V 2(PO4)2.90F0.10 sample showed the best high rate performance. Its discharge capacity at 10 C rate was 117 mA h g−1 with 30th capacity retention of about 90.60%. The electrode reaction reversibility and electronic conductivity was enhanced, and the charge transfer resistance was decreased through F-substitution. The improved electrochemical performance of F-substitution Li3V 2(PO4)3 cathode materials were attributed to the above factors. |
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| Keywords: | B. Chemical synthesis C. Scanning electron microscopy E. X-ray spectroscopies |
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