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Title: 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 (Li 4Ti 5O 12), 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 Li 4+xTi 5O 12 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:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Univ. of California, Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1601347
Report Number(s):
[BNL-213640-2020-JAAM]
[Journal ID: ISSN 0036-8075]
Grant/Contract Number:  
[SC0012704]
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. doi: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. doi:10.1126/science.aax3520.
@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 = {2020},
month = {2}
}

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