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Seo, Dong-Hwa
Computational Energy Materials Science Lab
Research Interests
  • 본 연구실에서는 제일원리 (first-principles) 전산모사 기법을 통해 이차전지용 전극 소재와 고체 전해질 소재에 대해 원자 단위에서 깊이 있게 이해하고 이를 바탕으로 신규 소재를 개발하고 기존 소재의 성능 향상시키는 연구를 진행하고 있습니다. 또한 인공지능 (artificial intelligence)과 기계학습 (Machine learning), 로봇공학 (robotics)을 조합하여 자동 합성/분석을 통한 재료 개발에 대한 연구를 진행하고 있습니다.

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Kinetic pathways of ionic transport in fast-charging lithium titanate

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Title
Kinetic pathways of ionic transport in fast-charging lithium titanate
Author
Zhang, WeiSeo, Dong-HwaChen, TinaWu, LijunTopsakal, MehmetZhu, YimeiLu, DeyuCeder, GerbrandWang, Feng
Issue Date
2020-02
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Citation
SCIENCE, v.367, no.6481, pp.1030 - 1034
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.
URI
https://scholarworks.unist.ac.kr/handle/201301/31447
URL
https://science.sciencemag.org/content/367/6481/1030
DOI
10.1126/science.aax3520
ISSN
0036-8075
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