Enhanced cycle stability of rechargeable Li-O2 batteries using immobilized redox mediator on air cathode
- Authors
- 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
- Mar-2020
- Publisher
- Korean Society of Industrial Engineering Chemistry
- Keywords
- 2,2,6,6,-tetramethylpiperidinyl-1-oxyl; Lithium-oxygen batteries; Modified air cathode; Polydopamine; Redox mediator
- Citation
- Journal of Industrial and Engineering Chemistry, v.83, pp 14 - 19
- Pages
- 6
- Journal Title
- Journal of Industrial and Engineering Chemistry
- Volume
- 83
- Start Page
- 14
- End Page
- 19
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/44265
- DOI
- 10.1016/j.jiec.2019.11.015
- ISSN
- 1226-086X
1876-794X
- Abstract
- Overcoming the low round-trip energy efficiency and poor cycle stability of lithium-oxygen (Li-O2) 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-O2 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-O2 batteries. © 2019 The Korean Society of Industrial and Engineering Chemistry
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