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High-rate characteristic of F-substitution [formula omitted]cathode materials for Li–ion batteries

Solid State Communications
Publication Date
DOI: 10.1016/j.ssc.2009.06.019
  • B. Chemical Synthesis
  • C. Scanning Electron Microscopy
  • E. X-Ray Spectroscopies
  • Chemistry


Abstract The effect of fluorine substitution on the electrochemical properties of Li 3V 2(PO 4) 3 cathode materials was studied. Samples with stoichiometric proportions of Li 3V 2(PO 4) 3− x F x ( x = 0 , 0.05 , 0.10 , 0.15 ) were prepared by adding LiF in the starting materials of Li 3V 2(PO 4) 3. XRD studies showed that the F-substituted Li 3V 2(PO 4) 3 had the same monoclinic structure as the un-substituted Li 3V 2(PO 4) 3. SEM images showed that F-substitution Li 3V 2(PO 4) 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 Li 3V 2(PO 4) 2.90F 0.10 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 Li 3V 2(PO 4) 3 cathode materials were attributed to the above factors.

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