Tailoring oriented TiO2 nanotube morphology for improved Li storage kinetics

[Display omitted] ► Oriented TiO2 nanotube (NT) arrays were prepared by anodization. ► The NT morphology such as pore diameter and wall thickness was varied by adjusting anodization conditions. ► The TiO2 NT electrode has capacitive Li+ storage associated with the NT surface as well as bulk storage....

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Bibliographic Details
Published in:Electrochimica acta 2013-01, Vol.88, p.123-128
Main Authors: Kim, Jae-Hun, Zhu, Kai, Kim, Jin Young, Frank, Arthur J.
Format: Article
Language:English
Subjects:
Anodization
Applied sciences
Arrays
Chemistry
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electrochemistry
Electrodes
Exact sciences and technology
General and physical chemistry
Li storage kinetics
Li-ion battery
Lithium batteries
Mathematical morphology
Nanomaterials
Nanostructure
Nanotube
New technology
Roughness
TiO2
Titanium dioxide
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Summary:[Display omitted] ► Oriented TiO2 nanotube (NT) arrays were prepared by anodization. ► The NT morphology such as pore diameter and wall thickness was varied by adjusting anodization conditions. ► The TiO2 NT electrode has capacitive Li+ storage associated with the NT surface as well as bulk storage. ► The NT morphological parameters are found to have significant effects on the Li-ion insertion/extraction kinetics. We report on the syntheses of oriented TiO2 nanotube (NT) arrays having different geometries and the electrochemical properties as electrodes for lithium rechargeable batteries. The morphology of the NT arrays, which were prepared by electrochemical anodization of Ti foil, is investigated by scanning electron microscopy. X-ray diffraction analysis indicates that annealing the as-grown NT films at a temperature of 400°C transforms them from an amorphous phase to anatase TiO2. Analyses of cyclic voltammograms indicate that there is significant capacitive Li+ storage associated with the NT surface in addition to the Li+ storage within the bulk material. The NT morphological parameters (e.g. pore diameter, wall thickness, and roughness factor) are found to have significant effects on the Li-ion insertion/extraction kinetics and the performance of the electrodes in lithium-ion batteries.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2012.10.013