| 학회 |
한국화학공학회 |
| 학술대회 |
2018년 가을 (10/24 ~ 10/26, 대구 EXCO) |
| 권호 |
24권 2호, p.1586 |
| 발표분야 |
에너지 환경(Energy and Environment) |
| 제목 |
Tailoring nucleation and growth of Li2S by electrolyte anion selection: A step forward to achieving full utilization of sulfur for high performance Li-S batteries |
| 초록 |
Untamed deposition of lithium sulfide (Li2S) imposes an adamant limitation to achieve high capacity of lithium sulfur (Li-S) batteries. Solvents with high Gutmann donor number (DN) can elevate the sulfur utilization with amending the discharging pathway; however, the approach reveals its inadequacy of severe Li metal corrosion. Herein, we report that three-dimensional (3D) Li2S growth can be attained by utilizing salt anions with high-DN. Ex-situ analyses and electrochemical measurements demonstrate that, with increasing the DN of the anion, 3D Li2S growth is more favored based on an increased Li2S solubility. As a result, the use of Br- leads to 95 % of sulfur utilization during a discharge process. In addition, the electrolytes with high-DN anions have more compatibility with Li metal electrodes compared to those with high-DN solvents. Based on the amelioration, the new approach enables a high sulfur-loaded Li-S battery of 4 mAh cm-2 areal capacity. This finding offers a facile but effective strategy to modulate Li2S growth mode while maintaining the Li metal stability for high-performance Li-S batteries. |
| 저자 |
추현원, 노형준, 김윤정, 육성민, 이주혁, 이진홍, 곽호범, 김희탁
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| 소속 |
KAIST |
| 키워드 |
에너지 환경 |
| E-Mail |
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| 원문파일 |
초록 보기 |
