(The) role of electrolyte anions on $Li_2S$ growth realizing high-performance Li-S batteries = 전해질 염에 따른 리튬 설파이드의 성장 원리 분석을 통한 고성능 리튬 황 전지 개발

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Passivation of a sulfur cathode by uncontrolled growth of insulating lithium sulfide imposes a limitation in achieving high sulfur utilization of lithium-sulfur batteries. In electrolytes based on solvents with high Gutmann Donor Number, sulfur utilization can be augmented; however, this approach reveals the drawback of violent lithium metal corrosion. Here we report that particulate lithium sulfide growth can be achieved when using a salt anion with a high donor number such as bromide or triflate. The use of bromide leads to ~95 % sulfur utilization by suppressing electrode passivation. More importantly, the electrolytes with high-donor number salt anions are notably compatible with lithium metal electrodes. The approach enables a high sulfur-loaded cell with areal capacity higher than 4 mA h $cm^{-2}$ and high sulfur utilization (> 90 %). This finding offers a simple but practical strategy to modulate lithium sulfide growth mode, while conserving the stability for high-performance lithium-sulfur batteries.
Advisors
Kim, Hee-Takresearcher김희탁researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2019.2,[iv, 67 p. :]

Keywords

Lithium-sulfur battery▼ahigh sulfur utilization▼a$Li_2S$ electrodeposition▼a3D growth▼adonor number▼asalt modification▼asolution-mediated reaction; 리튬 황 전지▼a고황유용 전지▼a전자 기여도▼a리튬 설파이드 도금▼a3차원 성장▼a전해질 염 제어

URI
http://hdl.handle.net/10203/266319
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=843268&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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