Room temperature ionic liquids versus organic solvents as lithium-oxygen battery electrolytes

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 2 ) battery electrolytes. The electrochem...

Full description

Saved in:
Bibliographic Details
Published inNew journal of chemistry Vol. 42; no. 6; pp. 4693 - 4699
Main Authors Knipping, E, Aucher, C, Guirado, G, Aubouy, L
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 2018
Subjects
Batteries
Coordination numbers
Dimethyl ether
Electrolytes
Electrolytic cells
Ion currents
Ionic liquids
Ions
Lithium
Nonaqueous electrolytes
Room temperature
Solvation
Solvents
Stability analysis
Thermal stability
Viscosity
Online AccessGet full text

Cover

More Information
Summary: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 2 ) battery electrolytes. The electrochemical tests of these RTILs are also carried out in Li-O 2 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 2 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. Correlation between the physicochemical properties of ionic liquid-based electrolytes and lithium-oxygen battery performance.
ISSN:1144-0546
1369-9261
DOI:10.1039/c8nj00449h