中文摘要：

以LiF、LiOH和NH4VO3为原料，采用柠檬酸溶胶-凝胶法合成了F掺杂锂钒氧化物LiV3F2xO8-x（x=0．01、O．025、0．05、0．1）。利用X射线衍射（XRD）、透射电镜（TEM）等测试手段对合成材料进行了表征。通过恒流充放电、循环伏安和交流阻抗技术研究了材料的电化学性能。结果表明。所得样品的结晶性较好、结构完整。F的掺杂能有效提高锂钒氧化物的首次充放电容量，但如果掺杂量过多，则会损坏材料的循环充放电性能。在所有掺杂样品中。理论组成为LiV3F0.05O0.975的样品表现出较好的充放电循环性能。

英文摘要：

Layered-type compounds of lithium vanadium oxides LiV3F2xO8-x （ x=0.01,0.025,0.05,0.1） were synthesized by the sol-gel technique of citric acid with LiF, LiOH and NH4VO3 as raw materials. The synthesized samples were characterized by XRD, TEM,et al. The galvanostatic charge-discharge, AC impedance technique and cyclic voltammetry tests were also used to investigate the electrochemical properties of doped materials. The results show that the products have high crystallinity and perfect layered-type structure. The initial charge-discharge capacities of fluorine doped samples have better doping effect, but their cycling performance is decayed rapidly with the increase of F ion content. The charge-discharge performance and cyclestability of LiV3F0.05T.7.975 sample are the best in all doped samples.