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Enhancing Oxygen Adsorption Capabilities in Li-O2 Battery Cathodes through Solid Perfluorocarbons

Abstract

Miscible and immiscible liquid perfluorocarbonates (PFCs), known for their exceptional oxygen transport properties, have been successfully incorporated in Li-O2 battery, which exhibited improved battery performance. The desire to incorporate low vapour pressure PFCs during the cathode preparation procedure encouraged the transition from liquid to solid PFCs. Such materials were added at different weight percentage to carbon black-based air electrodes. Li-O2 battery performance utilizing these incorporated materials in their air cathode was investigated at different current densities and consequently, the optimal composition in terms of [carbon: PFC: binder] was determined. Discharge product investigation revealed a denser and a finer product (lithium peroxide, Li2O2) morphology through the entire cathode volume upon PFC incorporation, supporting the improved battery performance observed. The mesopores structure accomplished with the addition of PFCs was found to be highly advantageous, leading to lower charge resistance, increased the battery’s organic electrolyte penetration rate and uptake. Electrochemical investigation conducted with different electrodes, as well as modification of some experimental conditions, pointed that enhanced oxygen adsorption capabilities is the main factor responsible for a uniform deposition of discharge products at the electrolyte-facing side, which is commonly bare of products, and ultimately for the improved battery performance observed upon PFCs addition.

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Publication details

The article was received on 18 Apr 2017, accepted on 05 Jun 2017 and first published on 05 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA03376A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Enhancing Oxygen Adsorption Capabilities in Li-O2 Battery Cathodes through Solid Perfluorocarbons

    M. Balaish and Y. Ein-Eli, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03376A

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