二氧化钛纳米管的电化学嵌锂性能
首发时间:2005-12-07
摘要:一维纳米氧化钛由于具有大的比表面和丰富的表面缺陷而具有独特的电化学脱嵌锂性能,我们用金红石和氢氧化钠发生水热反应制备了10~15nm直径,200~400nm长的质子钛酸盐纳米管,这些纳米管在氩气氛下500°C煅烧可以转变成为锐钛矿型二氧化钛纳米管。经测试,这些锐钛矿型二氧化钛纳米管拥有高的可逆放电容量,良好的高倍率放电容量和大电流密度下好的循环寿命。
关键词: 纳米管 二氧化钛 电化学
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Electrochemical Performance of Anatase Nanotubes for Lithium Ion Insertion
Abstract:The titanium oxides with one-dimensional nanostructure are of significant interest for the electrochemical lithium insertion and extraction because of their large specific surface area and numerous surface defects. In this letter, nanotubes of 10-15 nm in outer diameter and 200~400 nm in length were prepared by a reaction between rutile TiO2 and caustic soda under hydrothermal conditions. These nanotubes are protonated titanate and can be converted into the anatase nanotubes after the calcination at 500°C in argon atmosphere. The anatase nanotubes exhibited a high reversible discharge capacity, excellent high-rate discharge capability and good cycle stability under the large current density.
Keywords: Nanotubes, TiO2, Electrochemistry
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