Electrochemical Evaluation of Surface Modified Free-Standing CNT Electrode for Li-O-2 Battery Cathode
- Authors
- Lee, Ji Hyeon; Jung, Hyun Wook; Kim, In Soo; Park, Min; Kim, Hyung-Seok
- Issue Date
- 2021-07
- Publisher
- MDPI
- Citation
- ENERGIES, v.14, no.14
- 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 (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-O-2 batteries.
- Keywords
- CARBON NANOTUBES; LITHIUM; OXYGEN; GRAPHENE; FUNCTIONALIZATION; LIMITATIONS; MECHANISM; PAPER; O-2; CARBON NANOTUBES; LITHIUM; OXYGEN; GRAPHENE; FUNCTIONALIZATION; LIMITATIONS; MECHANISM; PAPER; O-2; Li-O-2 battery; air cathode; CNT; oxygen functional groups; titration
- ISSN
- 1996-1073
- URI
- https://pubs.kist.re.kr/handle/201004/116793
- DOI
- 10.3390/en14144196
- Appears in Collections:
- KIST Article > 2021
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