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In-situ electrochemical functionalization of carbon materials for high-performance Li–O2 batteries

Authors :
Jaekook Kim
Dong Wook Kim
Do Youb Kim
Jungdon Suk
Yongku Kang
Jinmin Kim
Jungwon Kang
Source :
Journal of Energy Chemistry. 48:7-13
Publication Year :
2020
Publisher :
Elsevier BV, 2020.

Abstract

The development of effective synthetic routes is important to manifest proper nature of specific materials. In-situ electrochemical functionalization possesses great advantages over conventional routes, especially facile way and leading to reaching elaborate sites of functional group. Here, we demonstrate the preparation of functionalized carbons by in-situ electrochemical reduction in an argon atmosphere for application in low-cost, environmentally benign, and high-performance oxygen-electrodes for non-aqueous Li–O2 batteries. A Li–O2 battery with functionalized carbon shows a high discharge capacity (100 times that of pristine carbon), high power and cycling stability. The outstanding performance is attributed to the high O2 affinity of the functionalized carbon surface that facilitates the formation of soluble and diffusible superoxide intermediates by the reduction of the remaining O2 competing with surface growth for Li2O2 formation.

Details

ISSN :
20954956
Volume :
48
Database :
OpenAIRE
Journal :
Journal of Energy Chemistry
Accession number :
edsair.doi...........84efccf76aa2a2616ae3aea5143fd5f1
Full Text :
https://doi.org/10.1016/j.jechem.2019.12.016