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김영식

Kim, Youngsik
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Highly improved voltage efficiency of seawater battery by use of chloride ion capturing electrode

Author(s)
Kim, KyounghoHwang, Soo MinPark, Jeong-SunHan, JinhyupKim, JunsooKim, Youngsik
Issued Date
2016-05
DOI
10.1016/j.jpowsour.2016.02.060
URI
https://scholarworks.unist.ac.kr/handle/201301/19208
Fulltext
http://www.sciencedirect.com/science/article/pii/S0378775316301677
Citation
JOURNAL OF POWER SOURCES, v.313, pp.46 - 50
Abstract
Cost-effective and eco-friendly battery system with high energy density is highly desirable. Herein, we report a seawater battery with a high voltage efficiency, in which a chloride ion-capturing electrode (CICE) consisting of Ag foil is utilized as the cathode. The use of Ag as the cathode leads to a sharp decrease in the voltage gaps between charge and discharge curves, based on reversible redox reaction of Ag/AgCl (at similar to 2.9 V vs. Na+/Na) in a seawater catholyte during cycling. The Ag/AgCl reaction proves to be highly reversible during battery cycling. The battery employing the Ag electrode shows excellent cycling performance with a high Coulombic efficiency (98.6-98.7%) and a highly improved voltage efficiency (90.3% compared to 73% for carbonaceous cathode) during 20 cycles (total 500 h). These findings demonstrate that seawater batteries using a CICE could be used as next-generation batteries for large-scale stationary energy storage plants.
Publisher
ELSEVIER SCIENCE BV
ISSN
0378-7753
Keyword (Author)
Seawater batteryVoltage efficiencyChloride ion capturing electrodeSilver electrode
Keyword
SODIUM-AIR BATTERIESCERAMIC SEPARATOROXYGEN REDUCTIONCATALYSTCELLCHALLENGESLITHIUM

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