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Issue 97, 2015
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Lithium–oxygen batteries with ester-functionalized ionic liquid-based electrolytes

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Abstract

Ester-functionalized ionic liquids with different cations (imidazolium, pyrrolidinium, piperidinium, morpholinium) and a bis(trifluoromethanesulfonyl)imide anion were synthesized and subsequently mixed with tetra(ethylene glycol)dimethylether (TEGDME) at different concentrations. The mixed solutions were ultimately investigated for their applicability as the electrolyte in non-aqueous lithium–oxygen batteries. Among the ionic liquids investigated, the pyrrolidinium-based ionic liquid, ethyl-N-methylpyrrolidinium-N-acetate bis(trifluoromethanesulfonyl)imide (MEEsPyr-TFSI), exhibited a lower viscosity, higher ionic conductivity and wider electrochemical stability window than any other ionic liquids. The addition of an appropriate amount of MEEsPyr-TFSI to the TEGDME-based organic electrolyte had a positive effect on the ionic conductivity, electrochemical stability and oxygen radical stability. A mixed ionic liquid-based solution with an optimum composition was successfully employed as a promising electrolyte for lithium–oxygen batteries with good cycling stability.

Graphical abstract: Lithium–oxygen batteries with ester-functionalized ionic liquid-based electrolytes

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Supplementary files

Article information


Submitted
13 Jul 2015
Accepted
14 Sep 2015
First published
14 Sep 2015

RSC Adv., 2015,5, 80014-80021
Article type
Paper
Author version available

Lithium–oxygen batteries with ester-functionalized ionic liquid-based electrolytes

J. Kim, H. Woo, S. Jin, J. S. Lee, W. Kim, K. Ryu and D. Kim, RSC Adv., 2015, 5, 80014
DOI: 10.1039/C5RA13682B

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