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000810840 1001_ $$00000-0002-9175-2616$$aWandt, Johannes$$b0$$eCorresponding author
000810840 245__ $$aSinglet Oxygen Formation during the Charging Process of an Aprotic Lithium-Oxygen Battery
000810840 260__ $$aWeinheim$$bWiley-VCH$$c2016
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000810840 520__ $$aAprotic lithium–oxygen (Li–O2) batteries have attracted considerable attention in recent years owing to their outstanding theoretical energy density. A major challenge is their poor reversibility caused by degradation reactions, which mainly occur during battery charge and are still poorly understood. Herein, we show that singlet oxygen (1Δg) is formed upon Li2O2 oxidation at potentials above 3.5 V. Singlet oxygen was detected through a reaction with a spin trap to form a stable radical that was observed by time- and voltage-resolved in operando EPR spectroscopy in a purpose-built spectroelectrochemical cell. According to our estimate, a lower limit of approximately 0.5 % of the evolved oxygen is singlet oxygen. The occurrence of highly reactive singlet oxygen might be the long-overlooked missing link in the understanding of the electrolyte degradation and carbon corrosion reactions that occur during the charging of Li–O2 cells.
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000810840 7001_ $$0P:(DE-Juel1)156296$$aJakes, Peter$$b1$$eCorresponding author$$ufzj
000810840 7001_ $$0P:(DE-Juel1)162401$$aGranwehr, Josef$$b2$$ufzj
000810840 7001_ $$0P:(DE-HGF)0$$aGasteiger, Hubert A.$$b3
000810840 7001_ $$0P:(DE-Juel1)156123$$aEichel, Rüdiger-A.$$b4$$ufzj
000810840 773__ $$0PERI:(DE-600)2011836-3$$a10.1002/anie.201602142$$gVol. 55, no. 24, p. 6892 - 6895$$n24$$p6892 - 6895$$tAngewandte Chemie / International edition$$v55$$x1433-7851$$y2016
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