| 학회 |
한국고분자학회 |
| 학술대회 |
2020년 가을 (10/05 ~ 10/08, 부산컨벤션센터(BEXCO)) |
| 권호 |
45권 1호 |
| 발표분야 |
기능성 고분자 |
| 제목 |
Fluorinated Covalent Organic Polymers for High Performance Sulfur Cathodes in Lithium−Sulfur Batteries |
| 초록 |
Lithium-sulfur (Li-S) batteries offer far higher theoretical energy density than that of the commercial lithium-ion battery counterparts, but suffer predominantly from an irreversible shuttling process involving lithium polysulfides. Here we report a fluorinated covalent organic polymer (F-COP) as a template for high performance sulfur cathodes in Li-S batteries. Fluorination allows facile covalent anchoring of sulfur to a porous polymer framework via nucleophilic aromatic substitution reaction (SNAr), leading to high sulfur contents, e.g. over 70 wt%. The F-COP framework is microporous with 72% of pores being confined to three well-defined pore sizes, 0.58, 1.19, and 1.68 nm, effectively suppressing polysulfide dissolution via steric and electrostatic hindrance. Our findings suggest the F-COP family with the adaptability of SNAr chemistry and well-defined micropore structures as useful frameworks for highly sustainable sulfur electrodes in Li–S batteries. |
| 저자 |
신혁수1, 김도윤2, 김현진1, 김지헌2, 차국헌1, Cafer T. Yavuz2, 최장욱1
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| 소속 |
1서울대, 2카이스트 |
| 키워드 |
lithium sulfu batteries; covalent organic polymers; shuttling
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| E-Mail |
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