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When solubilized in a hexacarboxamide cryptand anion receptor, the peroxide dianion reacts rapidly with CO 2 in polar aprotic organic media to produce hydroperoxycarbonate (HOOCO 2  - ) and peroxydicarbonate ( - O 2 COOCO 2  - ). 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 CO 2 is general. Exposure of solid lithium peroxide (Li 2 O 2 ) to CO 2 in polar aprotic organic media results in aggressive oxidation. These findings indicate that CO 2 must not be introduced in conditions relevant to typical lithium-O 2 cell configurations, as production of HOOCO 2  - and - O 2 COOCO 2  - during lithium-O 2 cell cycling will lead to cell degradation via oxidation of organic electrolytes and other vulnerable cell components.

On the incompatibility of lithium–O2 battery technology with CO2

On the incompatibility of lithium–O₂ battery technology with CO₂