溶胶-凝胶-微波法制备Li1＋xV3O8及其性能研究

Study on electrochemical behavior of Li_(1+x)V_3O_8 synthesized by sol-gel-microwave method

直接利用微波将溶胶-凝胶制备的干凝胶前驱体于450℃下快速合成了纯相、晶粒发育度较低的层状Li1＋xV3O8。通过XRD、Gy和循环充放对样品的电化学性能进行了测试，结果表明，（100）晶面取向显著降低，2．5V放电平台明显。室温下，截止电压4～2V范围内，首次放电比容量达318mAh／g。各项性能均优于传统固相法合成的材料。

The precursor of lithium vanadium oxide is obtained via sol-gel technique of citric acid with LiOH and NH4 VO3. The samples of Li1＋x V3O8 with layered-structure crystallization are prepared by microwave as well as tubular furnace method. The powders synthesized with different method or process are investigated via XRD, C-V and charge/discharge test to evaluate the effect on structure and electrochemical behaviors. Results show that the most effective improvement of electrochemical performance is observed with the Li1＋xV3O8 sample obtained by microwaving at 450℃ for 150min.