کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1594471 | 1515671 | 2009 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: High-rate characteristic of F-substitution Li3V2(PO4)3 cathode materials for Li–ion batteries High-rate characteristic of F-substitution Li3V2(PO4)3 cathode materials for Li–ion batteries](/preview/png/1594471.png)
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=0,0.05,0.10,0.15x=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.
Journal: Solid State Communications - Volume 149, Issues 39–40, October 2009, Pages 1679–1683