Jump to main content
Jump to site search


Enhancing the Cycle Stability of Li-O2 Batteries via Functionalized Carbon Nanotube-based Electrodes

Abstract

Achieving the high theoretical energy density (~3500 Wh/kg) 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 pristine CNT cathode using 1:2.5 weight ratio of CNT to electrolyte 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 Wh/kgcell 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.

Back to tab navigation

Supplementary files

Article information


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

J. Mater. Chem. A, 2020, Accepted Manuscript
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. J. Lee, J. Park, K. Kang, D. Im and C. R. Park, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/C9TA12116A

Social activity

Search articles by author

Spotlight

Advertisements