Enhanced Electrochemical Performances of LiFePO4/C via V and F Co-doping for Lithium-Ion Batteries

作     者：占涛涛 李超 靳云霞 肖顺华 

作者机构：桂林理工大学化学与生物工程学院广西电磁化学功能材料重点实验室桂林541006 

出 版 物：《Chinese Journal of Chemical Physics》 (化学物理学报（英文）)

年 卷 期：2016年第29卷第3期

页      面：303-307,I0001页

核心收录：

学科分类：07[理学] 

基　　金：国家自然科学基金 the Science and Technology Research Projects of Guangxi institution of higher education the Guangxi Natural Science Foundation 

主　　题：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.