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Enhancing the cycle stability of Li–O2 batteries via functionalized carbon nanotube-based electrodes

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Abstract

Achieving the high theoretical energy density (∼3500 W h kg−1) of Li–O2 batteries involves maximizing the electrochemically active surface area (EASA) of the electrodes. Carbon nanotubes (CNTs) have been widely adopted for Li–O2 electrodes but their EASA is limited by their electrolyte-phobic surface nature and the strong van der Waals interaction between CNTs. To increase the affinity between CNT-based electrodes and the electrolyte without decreasing CNT chemical stability, CNT buckypapers are functionalized with 3,5-bis(trifluoromethyl)phenylmaleimide. The solubility parameters of the electrolyte and CNTs are considered so that the maleimide groups increase the affinity between the electrode and electrolyte and the 3,5-bis(trifluoromethyl)phenyl groups protect the maleimide groups from decomposition. The functionalized CNT cathode exhibits a 58% greater discharge capacity and a 50% increased cyclability compared to the pristine CNT cathode when a 1 : 2.5 weight ratio of CNT to electrolyte was used due to an increased EASA and steric hindrance effect. Finally, a 3D folded Li–O2 cell is fabricated using the functionalized CNT-based cathode and demonstrated 30 cycles at 100 W h kgcell−1 cutoff. These results clearly show that high energy density and long cycling performance of Li–O2 batteries can be achieved even with a much reduced amount of electrolyte by increasing the affinity between CNT-based electrodes and the electrolyte.

Graphical abstract: Enhancing the cycle stability of Li–O2 batteries via functionalized carbon nanotube-based electrodes

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Supplementary files

Article information


Submitted
04 Nov 2019
Accepted
07 Jan 2020
First published
08 Jan 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Enhancing the cycle stability of Li–O2 batteries via functionalized carbon nanotube-based electrodes

Y. S. Cho, H. Kim, M. Byeon, D. Y. Kim, H. Park, Y. Jung, Y. Bae, M. Kim, D. Lee, J. Park, K. Kang, D. Im and C. R. Park, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA12116A

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