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- W3100411192 abstract "Non-aqueous metal–oxygen batteries depend critically on the reversible formation/decomposition of metal oxides on cycling. Irreversible parasitic reactions cause poor rechargeability, efficiency, and cycle life, and have predominantly been ascribed to the reactivity of reduced oxygen species with cell components. These species, however, cannot fully explain the side reactions. Here we show that singlet oxygen forms at the cathode of a lithium–oxygen cell during discharge and from the onset of charge, and accounts for the majority of parasitic reaction products. The amount increases during discharge, early stages of charge, and charging at higher voltages, and is enhanced by the presence of trace water. Superoxide and peroxide appear to be involved in singlet oxygen generation. Singlet oxygen traps and quenchers can reduce parasitic reactions effectively. Awareness of the highly reactive singlet oxygen in non-aqueous metal–oxygen batteries gives a rationale for future research towards achieving highly reversible cell operation. The application of Li–O2 batteries is hindered by severe parasitic reactions in battery cycling. Here the authors show that the highly reactive singlet oxygen is the main cause for the electrolyte and carbon electrode degradation on discharge and charge." @default.
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- W3100411192 date "2017-03-20" @default.
- W3100411192 modified "2023-10-09" @default.
- W3100411192 title "Singlet oxygen generation as a major cause for parasitic reactions during cycling of aprotic lithium–oxygen batteries" @default.
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- W3100411192 doi "https://doi.org/10.1038/nenergy.2017.36" @default.
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