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  • 09월 05일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제120회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Advanced separator of high performance to maximize the effect of the soluble catalyst for Li-O2 batteries

2017년 8월 17일 16시 19분 04초
ELEC.P-452 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 20일 (금요일) 13:00~14:30
저자 및
seonhwa lee
Department of Energy Engineering, Hanyang University, Korea
Li–O2 batteries have a major obstacle regarding the large overpotential upon charging that results from the low conductivity of the discharge product. Thus, various re(RMs) have been widely studied to reduce the overpotential upon the charging process; this should help promote the oxidation of Li2O2. However, since RMs degrade the Limetal anode through a parasitic reaction between the RM and the Li metal, a solution is needed to rectify this phenomenon. Here, we propose an effective method to prevent the migration of the RM toward the anode side of the lithium metal by using a modified separator with a negativelycharged polymer. When DMPZ (5,10dihydro5,10dimethylphenazine) is used as the RM, we find that the modified separator suppressed the migration of DMPZ toward the counter electrode of the Limetal anode; this is investigated by a visual redox couple diffusion test, morphological investigation, and Xray diffraction study. This advanced separator effectively maximizes the catalytic activity of the redox mediator. Li–O2 batteries using both a high oncentrated DMPZ and the modified separator exhibit improved performances and maintain 90% of the roundtrip efficiency up to the 20th cycle.