Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 15, Issue 26, Pages 11025-11037Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp51056e
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Funding
- BASF SE
- Alexander von Humboldt Foundation
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The decomposition of lithium peroxide during the charging process of lithium-air batteries is investigated. A novel preparation method for electrodes in the discharged state, i.e., prefilled with Li2O2 using polyethylene oxide as a binder, is presented. The composition and reactivity of Li2O2-prefilled electrodes are examined by thermal analysis coupled with on-line mass spectrometry. Voltage profiles and gas evolution during the charging process of Li2O2-prefilled electrodes in battery cells are correlated with the thermal decomposition process of Li2O2 and its impact on other electrode compounds. It is found that both thermal Li2O2 decomposition and the electrochemical decomposition of Li2O2 during charging enhance the oxidation of the electrolyte, the binder, and/or carbon, which is suggested to be due to the formation of nascent oxygen during Li2O2 decomposition into O-2 and Li2O (thermally) or into O-2 and lithium ions (electrochemically).
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