Evaluation and Stability of PEDOT Polymer Electrodes for Li–O₂ Batteries
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Hammond_Evaluation and stability.pdf
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Author(s)
Symister, Chanez
D’Arcy, Julio M.
Amanchukwu, Chibueze V.
Gauthier, Magali Aurelie Marie
Batcho, Thomas Peter
Shao-Horn, Yang
Hammond, Paula T
Date Issued
September 2016
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
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.
MIT 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
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1021/acs.jpclett.6b01986
