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A combined approach for high-performance Li–O2 batteries: A binder-free carbon electrode and atomic layer deposition of RuO2 as an inhibitor–promoter

Authors :
Hyun-Seop Shin
Gi Won Seo
Kyoungwoo Kwon
Kyu-Nam Jung
Sang Ick Lee
Eunsoo Choi
Hansung Kim
Jin-Ha Hwang
Jong-Won Lee
Source :
APL Materials, Vol 6, Iss 4, Pp 047702-047702-7 (2018)
Publication Year :
2018
Publisher :
AIP Publishing LLC, 2018.

Abstract

A rechargeable lithium–oxygen (Li–O2) battery is considered as a promising technology for electrochemical energy storage systems because its theoretical energy density is much higher than those of state-of-the-art Li-ion batteries. The cathode (positive electrode) for Li–O2 batteries is made of carbon and polymeric binders; however, these constituents undergo parasitic decomposition reactions during battery operation, which in turn causes considerable performance degradation. Therefore, the rational design of the cathode is necessary for building robust and high-performance Li–O2 batteries. Here, a binder-free carbon nanotube (CNT) electrode surface-modified by atomic layer deposition (ALD) of dual acting RuO2 as an inhibitor–promoter is proposed for rechargeable Li–O2 batteries. RuO2 nanoparticles formed directly on the binder-free CNT electrode by ALD play a dual role to inhibit carbon decomposition and to promote Li2O2 decomposition. The binder-free RuO2/CNT cathode with the unique architecture shows outstanding electrochemical performance as characterized by small voltage gaps (∼0.9 V) as well as excellent cyclability without any signs of capacity decay over 80 cycles.

Details

Language :
English
ISSN :
2166532X
Volume :
6
Issue :
4
Database :
Directory of Open Access Journals
Journal :
APL Materials
Publication Type :
Academic Journal
Accession number :
edsdoj.154b4cdc28794454816e09739a4872e5
Document Type :
article
Full Text :
https://doi.org/10.1063/1.5009399