On the incompatibility of lithium-O 2 battery technology with CO 2 .

Autor: Zhang S; Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , MA 02139-4307 , USA . Email: ccummins@mit.edu ; Tel: +1 617 253 5332., Nava MJ; Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , MA 02139-4307 , USA . Email: ccummins@mit.edu ; Tel: +1 617 253 5332., Chow GK; Department of Chemistry , University of California , Davis, One Shields Avenue , Davis , CA 95616 , USA., Lopez N; Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , MA 02139-4307 , USA . Email: ccummins@mit.edu ; Tel: +1 617 253 5332., Wu G; Department of Chemistry , Queen's University , 90 Bader Lane , Kingston , Ontario K7L3N6 , Canada., Britt DR; Department of Chemistry , University of California , Davis, One Shields Avenue , Davis , CA 95616 , USA., Nocera DG; Department of Chemistry and Chemical Biology , Harvard University , 12 Oxford Street , Cambridge , MA 02138 , USA., Cummins CC; Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , MA 02139-4307 , USA . Email: ccummins@mit.edu ; Tel: +1 617 253 5332.
Jazyk: angličtina
Zdroj: Chemical science [Chem Sci] 2017 Sep 01; Vol. 8 (9), pp. 6117-6122. Date of Electronic Publication: 2017 Jun 20.
DOI: 10.1039/c7sc01230f
Abstrakt: 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.
Databáze: MEDLINE
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