کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1621365 | 1005747 | 2009 | 4 صفحه PDF | دانلود رایگان |
Li3V2(PO4)3/Cu composite cathode material was prepared via sol–gel method by adding of 1.8 wt% Cu powder into the precursor solution. The structural and physical properties, as well as the electrochemical performance of the material were compared with those of Cu-free Li3V2(PO4)3. X-ray diffraction showed that Cu did not enter the crystal structure of Li3V2(PO4)3. The Li3V2(PO4)3/Cu composite material had a higher electronic conductivity comparing with that of Cu-free Li3V2(PO4)3. Electrochemical impedance spectroscopy showed that the adding of Cu decreased the charge transfer resistance of the electrode. In addition, the lithium diffusion coefficient was prominently enhanced from 1.3 × 10−9 to 2.8 × 10−8 cm2 s−1. Based on the these advantages, the Li3V2(PO4)3/Cu composite material exhibited much better cycling performance than the Cu-free Li3V2(PO4)3.
Journal: Journal of Alloys and Compounds - Volume 488, Issue 1, 20 November 2009, Pages L26–L29