VOxNT/CNT复合纳米管的制备及结构性能研究

项目名称： VOxNT/CNT复合纳米管的制备及结构性能研究

项目编号： No.50872101

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 朱泉峣

作者单位： 武汉理工大学

项目金额： 34万元

中文摘要： 本项目采用溶胶-凝胶结合水热法制备钒氧化物（VOx）与碳纳米管（CNT）纳米复合材料。通过改变水热反应材料比例、时间和温度，研究了该复合材料的形成过程，随着CNT的增加VOx晶体结构有序度降低；当水热反应温度达到170 ℃#20197;上才能得到稳定的交织互穿结构；随着水热反应时间的增长，氧化钒物相从V2O5向V3O7转变。通过对VOx/CNT纳米复合材料的电池性能研究发现其首次放电容量为331.3 mAh/g，50次后仍保持在187.1 mAh/g，充放电效率达97.2 %以上。另外，通过对主体材料的过渡金属元素掺杂来进行电化学性能改性，MoO3掺杂VOx/CNT使复合材料的循环稳定性得到了提高，TiO2掺杂VOx/CNT使复合材料的首次放电容量得到了增高。

中文关键词： 钒氧化物；碳纳米管；掺杂；纳米复合材料；电化学性能

英文摘要： This project prepared the vanadium oxide (VOx) and carbon magnitudes (CNT) nanocomposites via sol-gel method and the hydrothermal method. We explored this nanocomposites material's forming process through changing the rate of the charge, the reaction time and the hydrothermal temperature. With the increase of CNT, the crystal structure order degree of the VOx was lower. The vanadium oxide and CNT could be set a steady network structure when the hydrothermal temperature was higher than 170℃ With the reaction time increases the vanadium oxide's phase was transformed from V2O5 to V3O7. The vanadium oxide's cathode exhibited the capacity of 331.3 mAh/g at 0.2 C rate and excellent capability. What's more, the electrochemical performance was improved with doping some transition elements in the host material. The results showed that the composites' cycling ability was improved by doping MoO3, and the first charge/discharge capacity was raised by doping TiO2.

英文关键词： vanadium oxide; CNT; doped; nanocomposites; electrochemistry