用原位聚合法制备Fe PO4/PANI,以此为前驱体采用溶胶凝胶法制备LiFePO4/C复合材料。采用X射线衍射(XRD)、扫描电镜(SEM)对材料的结构及表面形貌进行表征,采用充放电测试研究材料的电化学性能。结果显示样品具有较好的倍率性能和循环性能,在650℃下合成的样品具有最高放电比容量,0.2 C下放电比容量达到165.8 m Ah/g,接近理论比容量170 m Ah/g。
Based on the method of in situ polymerization synthesis combined with two-step sinter- ing process, LiFel-xVx（PO4）（3-y）/3Fy/C was prepared. The effects of V and F co-doping on the structure, morphology, and electrochemical performances of LiFePO4/C were in- vestigated by X-ray diffraction, Fourier transform infrared spectra, scanning electron mi- croscope, charge/discharge tests, and electrochemical impedance spectroscopy, respectively. The results indicated that the V and F co-doping did not destroy the olivine structure of LiFePO4/C, but it can stabilize the crystal structure, decrease charge transfer resistance, enhance Li ion diffusion velocity, further improve its cycling and high-rate capabilities of LiFePO4/C.
