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

Author

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  • Ji Hyeon Lee

    (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)

  • Hyun Wook Jung

    (Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Korea)

  • In Soo Kim

    (Nanophotonics Research Center, Korea Institute of Science and Technology (KIST), Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Korea)

  • Min Park

    (Major in Materials Science and Engineering, Hallym University, Chuncheon 24252, Korea
    Integrative Materials Research Institute, Hallym University, Chuncheon 24252, Korea)

  • Hyung-Seok Kim

    (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, Korea)

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 (H 2 SO 4 :HNO 3 = 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 Li 2 O 2 , 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.

Suggested Citation

  • Ji Hyeon Lee & Hyun Wook Jung & In Soo Kim & Min Park & Hyung-Seok Kim, 2021. "Electrochemical Evaluation of Surface Modified Free-Standing CNT Electrode for Li–O 2 Battery Cathode," Energies, MDPI, vol. 14(14), pages 1-11, July.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:14:p:4196-:d:592586
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    References listed on IDEAS

    as
    1. Dahyun Oh & Jifa Qi & Yi-Chun Lu & Yong Zhang & Yang Shao-Horn & Angela M. Belcher, 2013. "Biologically enhanced cathode design for improved capacity and cycle life for lithium-oxygen batteries," Nature Communications, Nature, vol. 4(1), pages 1-8, December.
    2. Jun Lu & Yu Lei & Kah Chun Lau & Xiangyi Luo & Peng Du & Jianguo Wen & Rajeev S. Assary & Ujjal Das & Dean J. Miller & Jeffrey W. Elam & Hassan M. Albishri & D Abd El-Hady & Yang-Kook Sun & Larry A. C, 2013. "A nanostructured cathode architecture for low charge overpotential in lithium-oxygen batteries," Nature Communications, Nature, vol. 4(1), pages 1-10, December.
    3. Haiping Jia & Xiaolin Li & Junhua Song & Xin Zhang & Langli Luo & Yang He & Binsong Li & Yun Cai & Shenyang Hu & Xingcheng Xiao & Chongmin Wang & Kevin M. Rosso & Ran Yi & Rajankumar Patel & Ji-Guang , 2020. "Hierarchical porous silicon structures with extraordinary mechanical strength as high-performance lithium-ion battery anodes," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
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