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Issue 9, 2017
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On the incompatibility of lithium–O2 battery technology with CO2

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Abstract

When solubilized in a hexacarboxamide cryptand anion receptor, the peroxide dianion reacts rapidly with CO2 in polar aprotic organic media to produce hydroperoxycarbonate (HOOCO2) and peroxydicarbonate (O2COOCO2). Peroxydicarbonate is subject to thermal fragmentation into two equivalents of the highly reactive carbonate radical anion, which promotes hydrogen atom abstraction reactions responsible for the oxidative degradation of organic solvents. The activation and conversion of the peroxide dianion by CO2 is general. Exposure of solid lithium peroxide (Li2O2) to CO2 in polar aprotic organic media results in aggressive oxidation. These findings indicate that CO2 must not be introduced in conditions relevant to typical lithium–O2 cell configurations, as production of HOOCO2 and O2COOCO2 during lithium–O2 cell cycling will lead to cell degradation via oxidation of organic electrolytes and other vulnerable cell components.

Graphical abstract: On the incompatibility of lithium–O2 battery technology with CO2

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Publication details

The article was received on 17 Mar 2017, accepted on 19 Jun 2017 and first published on 20 Jun 2017


Article type: Edge Article
DOI: 10.1039/C7SC01230F
Citation: Chem. Sci., 2017,8, 6117-6122
  • Open access: Creative Commons BY license
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    On the incompatibility of lithium–O2 battery technology with CO2

    S. Zhang, M. J. Nava, G. K. Chow, N. Lopez, G. Wu, D. R. Britt, D. G. Nocera and C. C. Cummins, Chem. Sci., 2017, 8, 6117
    DOI: 10.1039/C7SC01230F

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