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利用v2O5·nH2O湿凝胶和Li2CO3作原料,通过溶液反应和低温焙烧的方法合成了用于锂离子电池正极的LiV3O8.对其前驱体和产品分别进行DTA—TG、XRD表征.LiV3O8用作锂离子电池正极的电化学性能利用恒电流充放电测试进行研究.实验表明活性材料LiV3O8具有较高的充放容量和良好的循环性能.Liv3O8电极的锂离子化学扩散系数由恒电位间歇滴定技术(PITT)来确定,其DLi+值依据Li1+xV3O8中x值的不同在10-8～10-10 cm2·s-1的变化范围内.获得的锂离子的扩散活化能为:Ea=25～42 kJ·mol-1(x=0.18.2.5).认为锂离子扩散的最大活化能是由锂离子在Li4V3O8相中的扩散决定的.
LiV3O8 was synthesized by solution reaction and calcination at low temperature using v2O5 · nH2O wet gel and Li2CO3 as raw materials, and its precursors and products were respectively characterized by DTA-TG and XRD. LiV3O8 was used as lithium The electrochemical performance of the positive electrode of the ion battery is studied by the constant current charge-discharge test.The experiment shows that the active material LiV3O8 has high charge-discharge capacity and good cycling performance.The lithium-ion chemical diffusion coefficient of Li3O8 electrode is determined by potentiostatic intermittent titration (PITT ), And its DLi + value is within the range of 10-8-10-10 cm2 · s-1 according to the value of x in Li1 + xV3O8.The diffusion activation energy of lithium ion obtained is: Ea = 25-42 kJ · Mol -1 (x = 0.18.2.5) .The maximum activation energy of lithium ion diffusion is determined by the diffusion of lithium ions in Li4V3O8 phase.