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  • 02월 26일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제115회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Rational Designs of Sulfur-Rich Polymers as New Cathode Materials for Lithium-Sulfur Batteries

2015년 2월 10일 14시 28분 18초
POLY.O-3 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 10시 : 30분
고분자화학 - General Oral Presentation
저자 및
김훈, 박문정*
포항공과대학교(POSTECH) 화학과, Korea
Rechargeable lithium-sulfur batteries have been considered as one of the most promising electrochemical energy storage systems on account of high theoretical capacity (1,674mAh/g) and the high specific energy (2600 Wh/kg). However, fast capacity fading within initial a few cycles was occasionally witnessed, attributed to the dissolution of polysulfide intermediates into organic electrolytes during charge/discharge cycling, impeding the development of practically viable batteries. In this study, we investigate the development of newLi-S batteries with improved cycle performance by synthesizing sulfur-rich polymers. Porous trithiocyanuric acid (TTCA) crystals having two functional groups of thiol and amine were employed as soft templates for the synthesis. The thiol moieties were particularly aimed to promote ring-opening polymerization of elemental sulfur along pore surfaces. Unique square tube morphology was obtained from the TTCA frameworks by optimizing crystallization solvents, which contain abundant micropores at the surfaces and macropores within the crystals, enabling the implementation of three-dimensionally interconnected sulfur-rich phases after vulcanization. Our Li-S batteries based on the new sulfur-rich macromolecules cell can deliver reversible discharge capacity of 945 mAh/g after 100 cycle at 0.2C with high capacity retention of 92%, as well as stable cycling performance over 450 cycles. These Li-S cells also demonstrated improved rate performance of 1210mAh/g at 0.1C and 730mAh/g at 5C. The markedly enhanced rate performance of our Li-S cells was rationalized by facilitated fast Li+-ion transport in sulfur-rich polymers along the organized amine moieties in TTCA ring.