Electrochemical evaluation of surface modified free-standing CNT electrode for Li–O2 battery cathode

Ji Hyeon Lee; Hyun Wook Jung; In Soo Kim; Min Park; Hyung Seok Kim

doi:10.3390/en14144196

Electrochemical evaluation of surface modified free-standing CNT electrode for Li–O₂ battery cathode

Ji Hyeon Lee, Hyun Wook Jung, In Soo Kim, Min Park, Hyung Seok Kim

Department of Chemical and Biological Engineering

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

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 (H₂ SO₄: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 Li₂ O₂, a discharge product, by approximately 13%. Hence, we can conclude that the ZnO@CNT is suitable as a cathode material for Li–O₂ batteries.

Original language	English
Article number	4196
Journal	Energies
Volume	14
Issue number	14
DOIs	https://doi.org/10.3390/en14144196
Publication status	Published - 2021 Jul 2

Bibliographical note

Funding Information:
Funding: This research was funded by Hallym University Research Fund, 2021 (HRF-202101-010).

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

Air cathode
CNT
Li–O battery
Oxygen functional groups
Titration

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Fuel Technology
Energy Engineering and Power Technology
Energy (miscellaneous)
Control and Optimization
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.3390/en14144196

Cite this

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title = "Electrochemical evaluation of surface modified free-standing CNT electrode for Li–O2 battery cathode",

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 (H2 SO4: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 Li2 O2, 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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author = "Lee, {Ji Hyeon} and Jung, {Hyun Wook} and Kim, {In Soo} and Min Park and Kim, {Hyung Seok}",

note = "Funding Information: Funding: This research was funded by Hallym University Research Fund, 2021 (HRF-202101-010). Publisher Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland.",

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AU - Lee, Ji Hyeon

AU - Jung, Hyun Wook

AU - Kim, In Soo

AU - Park, Min

AU - Kim, Hyung Seok

PY - 2021/7/2

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AB - 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 (H2 SO4: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 Li2 O2, 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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