Three-dimensionally branched carbon nanowebs as air-cathode for redox-mediated Li-O-2 batteries
- Authors
- Lim, Hee-Dae; Yun, Young Soo; Ko, Youngmin; Bae, Youngjoon; Song, Min Yeong; Yoon, Hyeon Ji; Kang, Kisuk; Jin, Hyoung-Joon
- Issue Date
- Jul-2017
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Carbon nanoweb; Macroporous carbon; Carbon nanofiber; Electrode; Li-O-2 batteries; Li2O2
- Citation
- CARBON, v.118, pp.114 - 119
- Indexed
- SCIE
SCOPUS
- Journal Title
- CARBON
- Volume
- 118
- Start Page
- 114
- End Page
- 119
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/187540
- DOI
- 10.1016/j.carbon.2017.03.033
- ISSN
- 0008-6223
- Abstract
- The optimal design of air-electrodes is one of the important keys to achieve the high rechargeability of Li-O2 batteries, however, remains as a challenging issue to date. Herein, we propose an air-electrode architecture based on three-dimensionally open macroporous carbon nanowebs (3-DOM-CNWs), which can be easily scaled-up maintaining its hierarchical structure of nano/micrometer-scale pores. It is demonstrated that the open macroporous nanoweb electrode is particularly advantageous for Li-O2 batteries utilizing the redox mediators in the electrolyte by facilitating the efficient transport of them. The 3-DOM-CNWs electrode could deliver higher specific capacity (∼14,000 mAh g−1) and longer cyclic stability with a better energy efficiency than the conventionally used Ketjen black (KB)-based electrode for redox-mediated Li-O2 batteries, while the specific surface area of 3-DOM-CNWs is only one fourteenth of that of the KB-based air-electrode. This result clearly demonstrates that the electrode architecture based on the hierarchical pore structures significantly enhances the electrochemical performance of Li-O2 batteries by aiding in the transport not only of lithium and oxygen but also the redox mediators.
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