کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1616309 | 1516376 | 2012 | 6 صفحه PDF | دانلود رایگان |
LiFePO4-based composite cathode materials have been synthesized by a rapid microwave chemical vapor deposition method within 10 min at temperatures as low as 550 °C. The samples prepared at different temperatures have been characterized by X-ray diffraction, field emission scanning electron microscope, energy dispersive X-ray spectroscopy, high resolution transmission electron microscopy and electrochemical measurements in lithium cells. Results show that the composite prepared at 650 °C exhibits the best electrochemical properties, with the discharge capacity as high as 122.7 mAh g−1 at 5 C and the charge transfer resistance as low as 80 Ω. This can mainly be attributed to the formation of a three-dimensional conductive network provided by vapor-grown carbon fiber, pyrolytic carbon film and graphite. The synthesis and processing approach presented here offer a simple and high-efficiency method to obtain high-performance LiFePO4 cathode materials.
► The structure of the samples change regularly with the temperature.
► A three-dimensional conductive network is formed in one step via this method.
► The properties of the samples can be controlled by adjusting the temperature.
Journal: Journal of Alloys and Compounds - Volume 517, 15 March 2012, Pages 176–181