As-grown vertically aligned amorphous TiO2 nanotube arrays as high-rate Li-based micro-battery anodes with improved long-term performance

作者：Lamberti Andrea^*; Garino Nadia; Sacco Adriano; Bianco Stefano; Chiodoni Angelica; Gerbaldi Claudio

来源：Electrochimica Acta, 2015, 151: 222-229.

DOI：10.1016/j.electacta.2014.10.150

• amorphous TiO2 nanotube
• anodic oxidation
• lithium battery
• rate capability
• cycling stability

Vertically oriented arrays of high surface area TiO2 nanotubes (NTs) are fabricated by the fast and facile anodic oxidation of a titanium foil. The formation of well-defined one-dimensional nanotubular carpets is assessed by means of morphological Field Emission Scanning Electron Microscopy characterisation, while X-ray diffraction analysis and Transmission Electron Microscopy imaging confirm the amorphous nature of the samples. The electrochemical response evaluated in lab-scale lithium cells is highly satisfying with near-theoretical initial specific capacity and remarkable rate capability, noteworthy in the absence of binders and conductive agents, which would affect the overall energy density. A specific capacity exceeding 200 mAh g(-1) is observed at very high 24 C and approx. 80 mAh g(-1) are retained even at very high 96 C rate, thus accounting for the promising prospects in storage devices conceived for high power applications. Moreover, the NTs can perform with good cycling stability and capacity retention approaching 50% of the initial value after very long-term operation along with improved durability (> 2000 cycles).

• 出版日期2015-1-1