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  • 02월 28일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Towards controlling of Li2O2 structures for improvement of charging overpotential in lithium-oxygen batteries

등록일
2019년 1월 17일 14시 30분 12초
접수번호
2764
발표코드
PHYS3-3 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 15시 : 20분
발표형식
심포지엄
발표분야
Physical Chemistry - Physical Chemistry Approaches in Energy and Environmental Materials
저자 및
공동저자
Hye Ryung Byon
Department of Chemistry, Korea Advanced Institute of Science and Technology, Korea
The rechargeable lithium-oxygen (Li-O2) battery, providing theoretically high specific-energy-density calculated as ~3 kWh kg-1cell, is a promising future energy storage system. However, the over-potential is considerably severe during charge due to difficulty of Li2O2 decomposition (Li2O2(s) --> 2Li+ + O2(g) + 2e, Erev = 2.96 V vs. Li+/Li), which is one of the greatest challenges for implementation of practical battery systems. Much effort has been devoted by incorporation of metal oxide promoters and soluble redox mediator. However, these additive materials give rise to more side reactions and require high cost. Here I present the new strategy of Li2O2 structural engineering to reduce the charge over-potential. The design of electrode surface can enhance adsorption affinity of O2 and LiO2, which determines morphology and structure of Li2O2. We found that the resulting amorphous Li2O2 facilely decomposes in comparison with crystal structure, which is attributed to increased ionic and electronic conductivity of Li2O2.

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