Development of material design for advanced lithium-sulfur batteries via nucleophilic substitution chemistry친핵치환 기반 고성능 리튬-황 전지용 재료 설계 및 개발

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For the last decade, in order to solve low energy density and specific capacity, which is a clear limitation of currently commercialized lithium secondary batteries, research and development has been positively implemented on secondary battery systems. Lithium-sulfur secondary batteries, which are evaluated as the most realistic of the next-generation secondary batteries, have advantages in terms of price and theoretical energy density, however, they have fundamental limitation of reducing lifespan characteristics due to lithium polysulfides dissolution and insulating nature of sulfur. In this Ph.D. dissertation, introducing one chemical approach to address the low conductivity and lithium polysulfides dissolution. The "nucleophilic aromatic substitution" is a synthesizing method of substituting fluorine functional group in an aromatic backbone to sulfur. This method achieves high reaction yields, conductivity, and lithium polysulfides adsorption capacity due to various heteroatoms and metals present in the aromatic molecule. Comprehensively, I have researched interaction between synthesized sulfur composites and lithium ion to reveal its electrochemical mechanisms.
Advisors
Chung, Sung-Yoonresearcher정성윤researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2021
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2021.8,[v, 64 p. :]

Keywords

lithium-sulfur batteries▼alithium polysulfides▼anucleophilic aromatic substitution▼aconductivity▼aenergy density; 리튬-황 이차전지▼a리튬 폴리설파이드▼a친핵성 방향족 치환▼a전도도▼a에너지 밀도

URI
http://hdl.handle.net/10203/295533
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=962538&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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