关键词:
LiFeP04/C
LiFel-xVx(POa)(3-y)/3Fy/C
Electrochemical performances
Diffusion velocity
摘要:
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.