Song, W;
Jiang, Q;
Xie, X;
Brookfield, A;
McInnes, EJL;
Shearing, PR;
Brett, DJL;
... Riley, DJ; + view all
(2019)
Synergistic storage of lithium ions in defective anatase/rutile TiO2 for high-rate batteries.
Energy Storage Materials
, 22
pp. 441-449.
10.1016/j.ensm.2019.07.025.
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Abstract
Fabrication of heterostructured materials is a strategy to boost the charge-transfer kinetics and the performance of high-rate lithium storage. Here, a facile, low-temperature method for the synthesis of high-area TiO2 nanospheres containing both anatase and rutile phases is described. The as-prepared materials contain a high concentration of oxygen vacancies facilitating electron conduction in the anatase phase and theoretical calculations provide evidence of a low energy barrier for Li+ transport in the rutile phase. The synergy between the two phases renders the shared conduction of electrons through anatase and Li+ ions via rutile at high-current rates, leading to the anodes that outperform the alternate TiO2 systems when the combination of capacity at high current densities and cycle stability are considered, displaying a capacity of 95.4 mAh g−1 at 10 A g−1 and a 97.2% retention of capacity over 500 cycles at 1 A g−1.
| Type: | Article |
|---|---|
| Title: | Synergistic storage of lithium ions in defective anatase/rutile TiO2 for high-rate batteries |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.ensm.2019.07.025 |
| Publisher version: | https://doi.org/10.1016/j.ensm.2019.07.025 |
| 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. |
| Keywords: | anatase and rutile TiO2; oxygen vacancy; lithium storage; synergistic effect |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10111933 |
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