| 학회 | 한국재료학회 |
| 학술대회 | 2016년 가을 (11/16 ~ 11/18, 경주 현대호텔) |
| 권호 | 22권 2호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | Strategies to Design Efficient Catalyst Systems for Lithium-Oxygen Batteries |
| 초록 | Sustainable energy storage systems are unquestionably needed to store and use renewable energy sources. In recent years lithium-oxygen (Li-O2) batteries have drawn much attention due to their exceptionally high energy density, which could exceed the capable value of conventional Li-ion batteries. Li-O2 batteries operate via distinct surface reactions that form (discharging) and evolve (charging) solid lithium-oxide products. However, the insufficient round trip efficiency and poor cyclability of current lithium-oxygen batteries must be solved before commercialization for large scale energy storage systems (i.e. smart grid) and electric vehicles. A common route to overcome the large overpotentials in Li-O2 batteries has been to develop various solid-state catalysts on the oxygen electrodes. Although these approaches have yielded incremental improvements, electron transfer at the electrochemical interface is slow and catalytic sites are easily deactivated by the precipitation of insulating products. Therefore, new catalyst chemistries and catalytic system architectures should be considered to alleviate electrode deactivation and offer continuous catalytic function. In this presentation, recent strategies to effectively preserve catalytic properties against deactivation issue will be introduced: (i) electrochemical control of discharge depth, (ii) geometric catalyst decoration, and (iii) incorporation of soluble catalyst in electrolyte. Thinner product layers are more easily evolved at catalytic sites on the oxygen electrode when products are located in close proximity, enabling more efficient electron transfer (electrochemical control of discharge depth). Second, dispersing catalyst sites in an insulating membrane over the oxygen electrode helps to maintain their function by reducing passivation of the active surfaces. Finally, I will present the use of a common heme biomolecule as a soluble, eco-friendly catalyst to promote Li-O2 reactions with reduced overpotentials. [1] W. H. Ryu, T. H. Yoon, S. H. Song, S. Jeon, Y. J. Park and I. D. Kim, Nano Lett, 2013, 13, 4190-4197. [2] F. S. Gittleson, W. H. Ryu and A. D. Taylor, ACS Appl Mater Interfaces, 2014, 6, 19017-19025. [3] W. H. Ryu, F. S. Gittleson, M. Schwab, T. Goh and A. D. Taylor, Nano Lett, 2015, 15, 434-441. [4] F. S. Gittleson, K. P. C. Yao, D. G. Kwabi, Sayed, W.-H. Ryu, Y. Shao-Horn and A. D. Taylor, ChemElectroChem, 2015, 2, 1446–1457. [5] W. H. Ryu, F. S. Gittleson, J. Li, X. Tong, and A. D. Taylor, Nano Lett, 2016, 16, 4799-4806. [6] W. H. Ryu, F. S. Gittleson, J. Thomsen, J. Li, M. Schwab, G. Brudvig, and A. D. Taylor, Nature Commun, 2016, In press, DOI: 10.1038/ncomms12925 |
| 저자 | 류원희 |
| 소속 | 숙명여자대 |
| 키워드 | <P>Lithium Oxygen Battery; Catalyst; Oxygen Evolution; Oxygen Electrode</P> |
