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Issue 28, 2013
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Stability of superoxide radicals in glyme solvents for non-aqueous Li–O2 battery electrolytes

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Abstract

Glyme-based electrolytes were studied for the use in lithium–air batteries because of their greater stability towards oxygen reduction reaction intermediates (e.g., superoxide anion radicals (O2˙)) produced upon discharge at the cathode compared to previously employed carbonate-based electrolytes. However, contradictory results of glyme stability tests employing KO2 as an O2˙ source were reported in the literature. For clarification, we investigated the reaction of KO2 with glymes of various chain lengths qualitatively using 1H NMR and FTIR spectroscopy as well as more quantitatively using UV-Vis spectroscopy. During our experiments we found a huge impact of small quantities of impurities on the stability of the solvents. Therefore, we studied further the influence of impurities in the glymes on the cycling behavior of Li–O2 cells, demonstrating the large effect of electrolyte impurities on Li–O2 cell performance.

Graphical abstract: Stability of superoxide radicals in glyme solvents for non-aqueous Li–O2 battery electrolytes

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Publication details

The article was received on 10 Apr 2013, accepted on 14 May 2013 and first published on 20 May 2013


Article type: Paper
DOI: 10.1039/C3CP51531A
Citation: Phys. Chem. Chem. Phys., 2013,15, 11830-11839

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    Stability of superoxide radicals in glyme solvents for non-aqueous Li–O2 battery electrolytes

    K. U. Schwenke, S. Meini, X. Wu, H. A. Gasteiger and M. Piana, Phys. Chem. Chem. Phys., 2013, 15, 11830
    DOI: 10.1039/C3CP51531A

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