December 2014Due to their high energy densities aprotic lithium-oxygen batteries are a promising energy storage system for future applications. However, the major drawback of this battery system are the high charging overpotentials which cause a significant energy loss and a poor cycle life. Coworkers of the Janek group recently showed that the use of dissolved TEMPO (2,2,6,6-Tetramethylpiperidinyloxyl) leads to a distinct reduction of the charging overpotentials and to an increased cycle life, cf. Bergner et al. J. Am. Chem. Soc. 2014, 136, 15054. The picture of the month shows the cycling profile of lithium oxygen cells with and without dissolved TEMPO as well as the proposed charging mechanism. (Picture submitted by Benjamin Bergner.)https://www.uni-giessen.de/en/faculties/f08/departments/physchem/janek/gallerypotm/pom2014/PoM1214/viewhttps://www.uni-giessen.de/@@site-logo/logo.png
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December 2014
Due to their high energy densities aprotic lithium-oxygen batteries are a promising energy storage system for future applications. However, the major drawback of this battery system are the high charging overpotentials which cause a significant energy loss and a poor cycle life. Coworkers of the Janek group recently showed that the use of dissolved TEMPO (2,2,6,6-Tetramethylpiperidinyloxyl) leads to a distinct reduction of the charging overpotentials and to an increased cycle life, cf. Bergner et al. J. Am. Chem. Soc. 2014, 136, 15054. The picture of the month shows the cycling profile of lithium oxygen cells with and without dissolved TEMPO as well as the proposed charging mechanism. (Picture submitted by Benjamin Bergner.)
