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Evaluation and Stability of PEDOT Polymer Electrodes for Li–O₂ Batteries

Author(s)
Symister, Chanez; D’Arcy, Julio M.; Amanchukwu, Chibueze V.; Gauthier, Magali Aurelie Marie; Batcho, Thomas Peter; Shao-Horn, Yang; Hammond, Paula T; ... Show more Show less
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Abstract
Lithium–air (O₂) batteries have shown great promise because of their high gravimetric energy density—an order of magnitude greater than Li-ion—but challenges such as electrolyte and electrode instability have led to poor capacity retention and low cycle life. Positive electrodes such as carbon and inorganic metal oxides have been heavily explored, but the degradation of carbon and the limited surface area of the metal oxides limit their practical use. In this work, we study the electron-conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) and show it can support oxygen reduction to form Li₂O₂ in a nonaqueous environment. We also propose a degradation mechanism and show that the formation of sulfone functionalities on the PEDOT surface and cleavage of the polymer repeat unit impairs electron conductivity and leads to poor cycling. Our findings are important in the search for new Li–O₂ electrodes, and the physical insights provided are significant and timely.
Date issued
2016-09
URI
http://hdl.handle.net/1721.1/111173
Department
Massachusetts Institute of Technology. Department of Chemical Engineering; Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Mechanical Engineering; Massachusetts Institute of Technology. Electrochemical Energy Laboratory; Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Journal of Physical Chemistry Letters
Publisher
American Chemical Society (ACS)
Citation
Amanchukwu, Chibueze V. et al. “Evaluation and Stability of PEDOT Polymer Electrodes for Li–O₂ Batteries.” The Journal of Physical Chemistry Letters 7, 19 (October 2016): 3770–3775 © 2016 American Chemical Society
Version: Author's final manuscript
ISSN
1948-7185

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