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Electrochemical Evaluation of Surface Modified Free-Standing CNT Electrode for Li-O-2 Battery Cathode

Authors
Lee, Ji HyeonJung, Hyun WookKim, In SooPark, MinKim, Hyung-Seok
Issue Date
7월-2021
Publisher
MDPI
Keywords
CNT; Li-O-2 battery; air cathode; oxygen functional groups; titration
Citation
ENERGIES, v.14, no.14
Indexed
SCIE
SCOPUS
Journal Title
ENERGIES
Volume
14
Number
14
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/137186
DOI
10.3390/en14144196
ISSN
1996-1073
Abstract
In this study, carbon nanotubes (CNTs) were used as cathodes for lithium-oxygen (Li-O-2) batteries to confirm the effect of oxygen functional groups present on the CNT surface on Li-O-2 battery performance. A coating technology using atomic layer deposition was introduced to remove the oxygen functional groups present on the CNT surface, and ZnO without catalytic properties was adopted as a coating material to exclude the effect of catalytic reaction. An acid treatment process (H2SO4:HNO3 = 3:1) was conducted to increase the oxygen functional groups of the existing CNTs. Therefore, it was confirmed that ZnO@CNT with reduced oxygen functional groups lowered the charging overpotential by approximately 230 mV and increased the yield of Li2O2, a discharge product, by approximately 13%. Hence, we can conclude that the ZnO@CNT is suitable as a cathode material for Li-O-2 batteries.
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