Abstract
The perpendicularly oriented anatase TiO2 microcones for Li-ion battery application were synthesized via anodization of a Ti foil in aqueous HF + H3PO4 solution. The TiO2 microcones exhibited a high active surface area with a hollow core depending on applied voltage and reaction time, confirmed by SEM, XRD and TEM with EDS mapping. Li insertion/desertion into TiO2 microcones was evaluated for the first time in half-cell configuration in terms of various current density and long-term cyclability. The electrochemical experiments demonstrated that the as-prepared TiO2 microcones as anode material exhibited 3 times higher capacity as compared with TiO2 nanotubular structures, excellent rate performance (0.054 mAhcm-2 even at 50 C) and reliable capacity retention during 500 cycles, which was attributed to facile diffusion of Li-ions induced in hollow anatase TiO2 microcones structure with multilayered nanofragment.
Original language | English |
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Pages (from-to) | 14558-14563 |
Number of pages | 6 |
Journal | ACS applied materials & interfaces |
Volume | 8 |
Issue number | 23 |
DOIs | |
State | Published - 15 Jun 2016 |
Bibliographical note
Publisher Copyright:© 2016 American Chemical Society.
Keywords
- anode
- anodization
- lithium ion batteries
- microcone
- titanium dioxide