聚吡咯修饰锂钒氧纳米管的制备及其电化学性能研究

Synthesis and Electrochemical Performance of Lithium Vanadium Oxide Nanotubes Decorated with Polypyrrole

以锂钒氧纳米管为载体,利用氧化聚合法制备了聚吡咯修饰锂钒氧纳米管复合纳米材料。形貌和结构分析表明所制备的样品经聚吡咯修饰后仍保持较好的纳米管状结构,管内径约20 nm左右,外径约100 nm左右;电化学性能测试表明经聚吡咯修饰后电极材料在不同倍率下放电比容量均有明显增加,经30次不同倍率循环后,容量保持率由修饰前的42.7%增加到55.8%,电化学性能的改善归因于聚吡咯高的电导率和良好的柔韧性。

A new inorganic/organic hybrid nanomaterial, which comprises lithium vanadium oxide nanotubes and polypyrrole,＇ was fabricated by oxidative polymerization. The analysis of the morphology and structure shows that lithium vanadium oxide nanotubes decorated with conducting polymer polypyrrole still maintain previous nanotubular structure ; the inner and outer diameters of the as-prepared samples are of about 20 nm and 100 nm, respectively. The electrochemical experiments demonstrate that lithium vanadium oxide nanotubes modified by polypyrrole have enhanced discharge capacity at different rates, and the capacity retention increases from 42.7% （before modification） to 55.8% （after modification） after 30 cycles at different rates, which may be attributed to high conductivity and good flexibility of the polypyrrole.