Room temperature ionic liquids versus organic solvents as lithium–oxygen battery electrolytes. (1st March 2018)

• Record Type: Journal Article
• Authors: Knipping, E.; Aucher, C.; Guirado, G.; Aubouy, L.
• Is Part Of: New journal of chemistry. Volume 42:Number 6(2018)
• Page Start: 4693
• Page End: 4699
• Publication Date: 2018-03-01
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj00449h
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Correlation between the physicochemical properties of ionic liquid-based electrolytes and lithium–oxygen battery performance. Abstract : Imidazolium, pyrrolidinium and piperidinium room temperature ionic liquids (RTILs) are characterized to evaluate their thermal stability, ionic conductivity, viscosity, potential window and lithium solvation, which are key parameters for lithium–oxygen (Li–O2 ) battery electrolytes. The electrochemical tests of these RTILs are also carried out in Li–O2 cells and show reasonable values of specific capacity, up to 1659 mA h per gram of carbon in the case of 1-propyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (PMI TFSI) with a molar fraction of 0.2 of LiTFSI. RTILs are compared with conventional organic electrolytes like ethylene carbonate (EC)/diethyl carbonate (DEC) solution or tetraethylene glycol dimethyl ether (TEGDME), which enables us to provide a further insight into ways of improving the electrolyte properties of Li–O2 batteries. In particular, a viscosity lower than 100 cP combined with a lithium coordination number lower than 1.5 tends to enhance the battery performance.