Room temperature ionic liquids versus organic solvents as lithium-oxygen battery electrolytes
Knipping, Etienne (Universitat Autònoma de Barcelona. Departament de Química)
Aucher, Christophe (Leitat Technological Center (Terrassa))
Guirado López, Gonzalo (Universitat Autònoma de Barcelona. Departament de Química)
Aubouy, Laurent (Leitat Technological Center (Terrassa))

Date:	2018
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-O) battery electrolytes. The electrochemical tests of these RTILs are also carried out in Li-O 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-O 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.
Grants:	European Commission 314508 Ministerio de Economía y Competitividad CTQ2015-65439-R
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Room temperature ionic liquid ; Electrolyte ; Li-O2 battery ; Ionic conductivity ; Lithium solvation
Published in:	New journal of chemistry, Vol. 42, Issue 6 (March 2018) , p. 4693-4699, ISSN 1369-9261

DOI: 10.1039/c8nj00449h

Postprint 10 p, 1.1 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group in Electrochemistry, Photochemistry and Organic Reactivity (GEFRO)
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