Enhanced cycle stability of rechargeable Li-O-2 batteries using immobilized redox mediator on air cathode
- Baik, Ji-Hoon; Lee, Su Young; Kim, Kihyun; Bae, Seongjun; Kim, Sangwan; Kwak, Soyoul; Hong, Dong Gi; Nam, Inho; Yi, Jongheop; Lee, Jong-Chan
- Issue Date
- ELSEVIER SCIENCE INC
- Lithium-oxygen batteries; Redox mediator; 2,2,6,6,-tetramethylpiperidinyl-1-oxyl; Polydopamine; Modified air cathode
- JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, v.83, pp.14 - 19
- Journal Title
- JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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- End Page
- Overcoming the low round-trip energy efficiency and poor cycle stability of lithium-oxygen (Li-O-2) batteries still remains a challenge. Here, we show that 2,2,6,6,-tetramethylpiperidinyl-1-oxyl (TEMPO)-immobilized air cathode can effectively reduce the charge voltage and increase the cycle stability in Li-O-2 batteries. The TEMPO-immobilized air cathode is prepared using a gas diffusion layer by a simple dip coating method, in which polydopamine is used as a linker. In this method, the immobilized TEMPO on the cathode does not crossover to the anode, and the consumption of TEMPO by side reactions is minimized. As a result, the redox mediation by TEMPO is well maintained in its immobilized state. This highlights that the use of an immobilized redox mediator can be a rational strategy for expanding the practical applications of Li-O-2 batteries. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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- 공학계열 > Dept.of Materials Engineering and Convergence Technology > Journal Articles
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