基于溶胶凝胶法制备Li_(1.2)V_(3)O_(8)及其电化学性能研究

Preparation and Electrochemical Properties of LiVO by Sol-gel Method

锂正极材料普遍存在循环性差,容量衰减快等缺点,但是钒元素的加入有利于改善材料的性能。本文通过溶胶凝胶法制备了Li_(1.2)V_(3)O_(8)材料,采用TG、XRD、SEM等物理方法对材料进行结构和形貌分析,并对其进行了电化学方法的表征。探究了温度对材料性能的影响,在0.1C、0.2 C、0.5 C、1 C、3 C的电流密度下各循环5周放电比容量分别为293 mAh/g、223 mAh/g、186 mAh/g、146 mAh/g、76 mAh/g,显示出优良的倍率性能。

Lithium cathode materials generally have some shortcomings such as poor circulation and fast capacity decay, but the addition of vanadium is beneficial to improve the performance of the materials. In this paper, Li_(1.2)V_(3)O_(8) material was prepared by sol-gel method. The structure and morphology of the material were analyzed by TG, XRD, SEM and other physical methods, and it was characterized by electrochemical method. The effect of temperature on the material properties was investigated. The specific discharge capacities of each cycle for 5 weeks were 293 mAh/g, 223 mAh/g, 186 mAh/g, 146 mAh/g and 76 mAh/g at the current densities of 0.1 C, 0.2 C, 0.5 C,1 C and 3 C, respectively, showing excellent rate performance.