Gardecka, AJ;
Lubke, M;
Armer, CF;
Ning, D;
Reddy, MV;
Williams, AS;
Lowe, A;
... Darr, JA; + view all
(2018)
Nb-doped rutile titanium dioxide nanorods for lithium-ion batteries.
Solid State Sciences
, 83
pp. 115-121.
10.1016/j.solidstatesciences.2018.07.004.
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Abstract
Rutile titanium dioxide is a promising negative electrode material for lithium-ion batteries due to low volume change on lithium-ion insertion, fast ion diffusion, and large surface area. However, the low theoretical capacity and conductivity of titanium dioxide has limited its application. In this work, rutile TiO2 was synthesized using a batch hydrothermal method, and doped with Nb5+ (3.5 at%). <Potentiodynamic/galvanostatic > cycling in the range 1.0–3.0 V vs Li/Li+ was used to determine the Li-ion capacity of the doped and pristine TiO2 material, and electrochemical cycling was used to measure the extent of conversion from the lithiated to de-lithiated state. The nanoscale structures of the pristine and doped materials were determined by powder X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and Brunauer-Emmett-Teller surface area measurements. Cycling in the range 1.0–3.0 V vs Li/Li+ showed that Nb5+ doping into the structure resulted in higher charge capacities. After 100 cycles at 100 mA g−1, the Nb-doped rutile TiO2 maintained a capacity of ca. 390 mAh g−1, 64% higher than undoped TiO2. For electrochemical cycling in the range 0.05–3.0 V vs Li/Li+, the introduction of Nb5+ resulted in a higher conversion of rutile TiO2 from the lithiated to de-lithiated state. The higher capacity of the doped TiO2 is shown to be mainly due to the smaller particle size, optimized surface area, and orientation of the nanorods.
| Type: | Article |
|---|---|
| Title: | Nb-doped rutile titanium dioxide nanorods for lithium-ion batteries |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.solidstatesciences.2018.07.004 |
| Publisher version: | https://doi.org/10.1016/j.solidstatesciences.2018.... |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10060533 |
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