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Three-dimensionally branched carbon nanowebs as air-cathode for redox-mediated Li-O-2 batteries

Cited 20 time in Web of Science Cited 20 time in Scopus
Authors
Lim, Hee-Dae; Yun, Young Soo; Ko, Youngmin; Bae, Youngjoon; Song, Min Yeong; Yoon, Hyeon Ji; Kang, Kisuk; Jin, Hyoung-Joon
Issue Date
2017-07
Citation
Carbon, Vol.118, pp.114-119
Keywords
Carbon nanowebMacroporous carbonCarbon nanofiberElectrodeLi-O-2 batteriesLi2O2
Abstract
The optimal design of air-electrodes is one of the important keys to achieve the high rechargeability of LiO2 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-O-2 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 (similar to 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-O-2 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-O-2 batteries by aiding in the transport not only of lithium and oxygen but also the redox mediators. (C) 2017 Elsevier Ltd. All rights reserved.
ISSN
0008-6223
URI
https://hdl.handle.net/10371/165016
DOI
https://doi.org/10.1016/j.carbon.2017.03.033
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Materials Science and Engineering (재료공학부)Journal Papers (저널논문_재료공학부)
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