Stability of superoxide radicals in glyme solvents for non-aqueous Li–O2 battery electrolytes

Autor:	Hubert A. Gasteiger, Michele Piana, K. Uta Schwenke, Stefano Meini, Xiaohan Wu
Rok vydání:	2013
Předmět:	Battery (electricity) chemistry.chemical_compound Aqueous solution chemistry Superoxide Impurity Inorganic chemistry Proton NMR General Physics and Astronomy Electrolyte Physical and Theoretical Chemistry Fourier transform infrared spectroscopy Spectroscopy
Zdroj:	Physical Chemistry Chemical Physics. 15:11830
ISSN:	1463-9084 1463-9076
DOI:	10.1039/c3cp51531a
Popis:	Glyme-based electrolytes were studied for the use in lithium-air batteries because of their greater stability towards oxygen reduction reaction intermediates (e.g., superoxide anion radicals (O2˙(-))) produced upon discharge at the cathode compared to previously employed carbonate-based electrolytes. However, contradictory results of glyme stability tests employing KO2 as an O2˙(-) source were reported in the literature. For clarification, we investigated the reaction of KO2 with glymes of various chain lengths qualitatively using (1)H NMR and FTIR spectroscopy as well as more quantitatively using UV-Vis spectroscopy. During our experiments we found a huge impact of small quantities of impurities on the stability of the solvents. Therefore, we studied further the influence of impurities in the glymes on the cycling behavior of Li-O2 cells, demonstrating the large effect of electrolyte impurities on Li-O2 cell performance.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7704fe5e1220a13461e55f8fbf7b0931 https://doi.org/10.1039/c3cp51531a Zobrazit plný text záznamu