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대한화학회 제124회 학술발표회 및 총회 Improving cycle performance of Li-O2 batteries by immobilized TEMPO on cathode

등록일
2019년 8월 21일 15시 10분 34초
접수번호
0719
발표코드
ELEC.P-408 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 17일 (목요일) 11:00~12:30
발표형식
포스터
발표분야
Electrochemistry
저자 및
공동저자
Ji Hyeon Kang, Inho Nam1,*
Chung-Ang University, Korea
1Chemical Engineering & Materials Science, Chung-Ang University, Korea
The rechargeable lithium-oxygen (Li-O2) batteries have received significant attention as a next-generation energy storage system with high capacity because of its high theoretical energy density, which approaches 3500 Wh kg-1. However, addressing low energy efficiency and poor cycle performance problems during their practical applications of Li-O2 batteries still remains challenging. Here, we present a novel Li-O2 battery system by immobilizing 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO) on the cathode, which can participate in the redox mediator without undergoing self-discharge, thereby improving the energy efficiency and cycle stability. The TEMPO-immobilized air cathode is prepared by simple dip coating method, in which polydopamine is used as a linker. In this method, the immobilized TEMPO on the cathode inhibited the degradation of TEMPO at the Li metal anode and could extensive Li2O2 oxidation over repeated cycles. Therefore, the use of an immobilized TEMPO as our rational strategy will provide a new perspective and breakthrough for the practical applications of Li-O2 batteries.

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