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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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A High‐Energy NASICON‐Type Cathode Material for Na‐Ion Batteries

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Title
A High‐Energy NASICON‐Type Cathode Material for Na‐Ion Batteries
Author
Wang, JingyangWang, YanSeo, Dong-HwaShi, TanChen, ShoupingTian, YaosenKim, HaegyeomCeder, Gerbrand
Issue Date
2020-03
Publisher
Wiley-VCH Verlag
Citation
ADVANCED ENERGY MATERIALS, v.10, no.10, pp.1903968
Abstract
Over the last decade, Na-ion batteries have been extensively studied as low-cost alternatives to Li-ion batteries for large-scale grid storage applications; however, the development of high-energy positive electrodes remains a major challenge. Materials with a polyanionic framework, such as Na superionic conductor (NASICON)-structured cathodes with formula NaxM2(PO4)(3), have attracted considerable attention because of their stable 3D crystal structure and high operating potential. Herein, a novel NASICON-type compound, Na4MnCr(PO4)(3), is reported as a promising cathode material for Na-ion batteries that deliver a high specific capacity of 130 mAh g(-1) during discharge utilizing high-voltage Mn2+/3+ (3.5 V), Mn3+/4+ (4.0 V), and Cr3+/4+ (4.35 V) transition metal redox. In addition, Na4MnCr(PO4)(3) exhibits a high rate capability (97 mAh g(-1) at 5 C) and excellent all-temperature performance. In situ X-ray diffraction and synchrotron X-ray diffraction analyses reveal reversible structural evolution for both charge and discharge.
URI
https://scholarworks.unist.ac.kr/handle/201301/49308
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.201903968
DOI
10.1002/aenm.201903968
ISSN
1614-6832
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