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TEMPO-Ionic Liquids as Redox Mediators and Solvents for Li–O2 Batteries
journal contribution
posted on 2020-02-24, 12:37 authored by Anastasiia Tkacheva, Jinqiang Zhang, Bing Sun, Dong Zhou, Guoxiu Wang, Andrew M. McDonaghEffective Li–O2 batteries require additives to
suppress the side reactions and the increase in charge potential at
the oxygen cathode, which leads to an inevitable battery failure.
In this study, two families of new 2,2,6,6-tetramethylpiperidine-1-oxyl
(TEMPO)-substituted imidazolium ionic liquids (TEMPOImILs) were synthesized,
and their properties were examined to determine the optimal structures
that function as both solvents and redox mediators in Li–O2 batteries. Comparison of the characteristics revealed that
batteries with TEMPOImILs bearing a hydrogen rather than a methyl
substituent in the 2-position of the imidazole moiety had a longer
cycle life, whereas the length of the alkyl chain connecting the imidazole
ring and 4-hydroxy-TEMPO did not have any substantial effect on the
battery performance.