Electrochemical Evaluation of Surface Modified Free-Standing CNT Electrode for Li–O2 Battery Cathode

In this study, carbon nanotubes (CNTs) were used as cathodes for lithium–oxygen (Li–O2) batteries to confirm the effect of oxygen functional groups present on the CNT surface on Li–O2 battery performance. A coating technology using atomic layer deposition was introduced to remove the oxygen function...

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Bibliographic Details
Published inEnergies (Basel) Vol. 14; no. 14; p. 4196
Main Authors Lee, Ji Hyeon, Jung, Hyun Wook, Kim, In Soo, Park, Min, Kim, Hyung-Seok
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 12.07.2021
Subjects
air cathode
Atomic layer epitaxy
Batteries
By products
Carbon
Cathodes
CNT
Decomposition
Electrochemical analysis
Electrochemistry
Electrode materials
Electrodes
Electrolytes
Energy
Functional groups
Lithium
Li–O2 battery
Nanotechnology
Nanowires
oxygen functional groups
Sulfuric acid
titration
Transmission electron microscopy
Zinc oxide
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Summary:In this study, carbon nanotubes (CNTs) were used as cathodes for lithium–oxygen (Li–O2) batteries to confirm the effect of oxygen functional groups present on the CNT surface on Li–O2 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–O2 batteries.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14144196