LAPSE:2023.33617
Published Article
LAPSE:2023.33617
Electrochemical Evaluation of Surface Modified Free-Standing CNT Electrode for Li−O2 Battery Cathode
April 21, 2023
Abstract
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.
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.
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Keywords
air cathode, CNT, Li–O2 battery, oxygen functional groups, titration
Subject
Suggested Citation
Lee JH, Jung HW, Kim IS, Park M, Kim HS. Electrochemical Evaluation of Surface Modified Free-Standing CNT Electrode for Li−O2 Battery Cathode. (2023). LAPSE:2023.33617
Author Affiliations
Lee JH: Center for Energy Storage Research, Korea Institute of Science and Technology (KIST), Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Korea; Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Korea
Jung HW: Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Korea [ORCID]
Kim IS: Nanophotonics Research Center, Korea Institute of Science and Technology (KIST), Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Korea [ORCID]
Park M: Major in Materials Science and Engineering, Hallym University, Chuncheon 24252, Korea; Integrative Materials Research Institute, Hallym University, Chuncheon 24252, Korea [ORCID]
Kim HS: Center for Energy Storage Research, Korea Institute of Science and Technology (KIST), Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Korea; Division of Energy and Environment Technology, KIST School, Korea University of Science and Technology, Seoul 02792
Jung HW: Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Korea [ORCID]
Kim IS: Nanophotonics Research Center, Korea Institute of Science and Technology (KIST), Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Korea [ORCID]
Park M: Major in Materials Science and Engineering, Hallym University, Chuncheon 24252, Korea; Integrative Materials Research Institute, Hallym University, Chuncheon 24252, Korea [ORCID]
Kim HS: Center for Energy Storage Research, Korea Institute of Science and Technology (KIST), Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Korea; Division of Energy and Environment Technology, KIST School, Korea University of Science and Technology, Seoul 02792
Journal Name
Energies
Volume
14
Issue
14
First Page
4196
Year
2021
Publication Date
2021-07-12
ISSN
1996-1073
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PII: en14144196, Publication Type: Journal Article
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LAPSE:2023.33617
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https://doi.org/10.3390/en14144196
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Apr 21, 2023
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