An Investigation on the Effect of Li-Ion Cycling on the Vertically Aligned Brookite TiO2 Nanostructure

摘要

We reported the investigation on the effect of Li-ion cycling on the vertically aligned brookite (β) TiO2 nanorods coated on Cu substrate as a Li-ion battery electrode. The vertically grown β- TiO2 nanorods synthesized over large area array using hot filament metal vapor deposition (HFMVD) technique were 19 nm in diameter with well-defined textural boundaries. X- ray photoelectron spectroscopy revealed the formation of stoichiometric β-TiO2 nanorods and Raman spectroscopy revealed the formation of pure brookite phase, and not accompanied by the anatase and/or rutile phases. The β-TiO2 nanorods showed good electrochemical performance with the appearance of the potential plateau at 1.8 and 2.1 V during Li insertion and desertion.