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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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Transition metal-doped Ni-rich layered cathode materials for durable Li-ion batteries

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Title
Transition metal-doped Ni-rich layered cathode materials for durable Li-ion batteries
Author
Sun, H. HohyunKim, Un-HyuckPark, Jeong-HyeonPark, Sang-WookSeo, Dong-HwaHeller, AdamMullins, C. BuddieYoon, Chong S.Sun, Yang-Kook
Issue Date
2021-11
Publisher
Nature Publishing Group
Citation
NATURE COMMUNICATIONS, v.12, no.1
Abstract
Doping is a well-known strategy to enhance the electrochemical energy storage performance of layered cathode materials. Many studies on various dopants have been reported; however, a general relationship between the dopants and their effect on the stability of the positive electrode upon prolonged cell cycling has yet to be established. Here, we explore the impact of the oxidation states of various dopants (i.e., Mg2+, Al3+, Ti4+, Ta5+, and Mo6+) on the electrochemical, morphological, and structural properties of a Ni-rich cathode material (i.e., Li[Ni0.91Co0.09]O2). Galvanostatic cycling measurements in pouch-type Li-ion full cells show that cathodes featuring dopants with high oxidation states significantly outperform their undoped counterparts and the dopants with low oxidation states. In particular, Li-ion pouch cells with Ta5+- and Mo6+-doped Li[Ni0.91Co0.09]O2 cathodes retain about 81.5% of their initial specific capacity after 3000 cycles at 200 mA g−1. Furthermore, physicochemical measurements and analyses suggest substantial differences in the grain geometries and crystal lattice structures of the various cathode materials, which contribute to their widely different battery performances and correlate with the oxidation states of their dopants.
URI
https://scholarworks.unist.ac.kr/handle/201301/54807
URL
https://www.nature.com/articles/s41467-021-26815-6
DOI
10.1038/s41467-021-26815-6
ISSN
2041-1723
Appears in Collections:
ECHE_Journal Papers
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