Kinetic pathways of ionic transport in fast-charging lithium titanate
Abstract
Fast-charging batteries typically use electrodes capable of accommodating lithium continuously by means of solid-solution transformation because they have few kinetic barriers apart from ionic diffusion. One exception is lithium titanate (Li4Ti5O12), an anode exhibiting extraordinary rate capability apparently inconsistent with its two-phase reaction and slow Li diffusion in both phases. Through real-time tracking of Li+ migration using operando electron energy-loss spectroscopy, we reveal that facile transport in Li4+xTi5O12 is enabled by kinetic pathways comprising distorted Li polyhedra in metastable intermediates along two-phase boundaries. Our work demonstrates that high-rate capability may be enabled by accessing the energy landscape above the ground state, which may have fundamentally different kinetic mechanisms from the ground-state macroscopic phases. This insight should present new opportunities in searching for high-rate electrode materials.
- Authors:
-
[1];
[2];
[3];
[1];
[1];
[1];
[1];
[3];
[1]
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Univ. of California, Berkeley, CA (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
- OSTI Identifier:
- 1601347
- Alternate Identifier(s):
- OSTI ID: 1807475
- Report Number(s):
- BNL-213640-2020-JAAM
Journal ID: ISSN 0036-8075
- Grant/Contract Number:
- SC0012704; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Science
- Additional Journal Information:
- Journal Volume: 367; Journal Issue: 6481; Journal ID: ISSN 0036-8075
- Publisher:
- AAAS
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE
Citation Formats
Zhang, Wei, Seo, Dong-Hwa, Chen, Tina, Wu, Lijun, Topsakal, Mehmet, Zhu, Yimei, Lu, Deyu, Ceder, Gerbrand, and Wang, Feng. Kinetic pathways of ionic transport in fast-charging lithium titanate. United States: N. p., 2020.
Web. doi:10.1126/science.aax3520.
Zhang, Wei, Seo, Dong-Hwa, Chen, Tina, Wu, Lijun, Topsakal, Mehmet, Zhu, Yimei, Lu, Deyu, Ceder, Gerbrand, & Wang, Feng. Kinetic pathways of ionic transport in fast-charging lithium titanate. United States. https://doi.org/10.1126/science.aax3520
Zhang, Wei, Seo, Dong-Hwa, Chen, Tina, Wu, Lijun, Topsakal, Mehmet, Zhu, Yimei, Lu, Deyu, Ceder, Gerbrand, and Wang, Feng. Thu .
"Kinetic pathways of ionic transport in fast-charging lithium titanate". United States. https://doi.org/10.1126/science.aax3520. https://www.osti.gov/servlets/purl/1601347.
@article{osti_1601347,
title = {Kinetic pathways of ionic transport in fast-charging lithium titanate},
author = {Zhang, Wei and Seo, Dong-Hwa and Chen, Tina and Wu, Lijun and Topsakal, Mehmet and Zhu, Yimei and Lu, Deyu and Ceder, Gerbrand and Wang, Feng},
abstractNote = {Fast-charging batteries typically use electrodes capable of accommodating lithium continuously by means of solid-solution transformation because they have few kinetic barriers apart from ionic diffusion. One exception is lithium titanate (Li4Ti5O12), an anode exhibiting extraordinary rate capability apparently inconsistent with its two-phase reaction and slow Li diffusion in both phases. Through real-time tracking of Li+ migration using operando electron energy-loss spectroscopy, we reveal that facile transport in Li4+xTi5O12 is enabled by kinetic pathways comprising distorted Li polyhedra in metastable intermediates along two-phase boundaries. Our work demonstrates that high-rate capability may be enabled by accessing the energy landscape above the ground state, which may have fundamentally different kinetic mechanisms from the ground-state macroscopic phases. This insight should present new opportunities in searching for high-rate electrode materials.},
doi = {10.1126/science.aax3520},
journal = {Science},
number = 6481,
volume = 367,
place = {United States},
year = {Thu Feb 27 00:00:00 EST 2020},
month = {Thu Feb 27 00:00:00 EST 2020}
}
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