Synergistic storage of lithium ions in defective anatase/rutile TiO2 for high-rate batteries
File(s)
Accepted version
Author(s)
Type
Journal Article
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.
Date Issued
2019-11-01
Date Acceptance
2019-07-16
Citation
Energy Storage Materials, 2019, 22, pp.441-449
ISSN
2405-8297
Publisher
Elsevier BV
Start Page
441
End Page
449
Journal / Book Title
Energy Storage Materials
Volume
22
Copyright Statement
© 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/.
Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Chemistry
Science & Technology - Other Topics
Materials Science
Anatase and rutile TiO2
Oxygen vacancy
Lithium storage
Synergistic effect
HIGH-RATE CAPABILITY
PHASE-TRANSFORMATION
NEGATIVE ELECTRODE
SURFACE-STRUCTURES
PARTICLE-SIZE
RUTILE
NANOPARTICLES
CARBON
PERFORMANCE
INSERTION
Publication Status
Published
Date Publish Online
2019-07-19