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

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

Energies, 2021, vol. 14, issue 14, 1-11

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.

Keywords: Li–O 2 battery; air cathode; CNT; oxygen functional groups; titration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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