Ionic Liquids in Lithium Battery Electrolytes: Composition versus Safety and Physical Properties
Artikel i vetenskaplig tidskrift, 2015

Ionic liquids have been highlighted as non-flammable, environmentally friendly, and suggested as possible solvents in lithium ion battery electrolytes. Here, the application of two ionic liquids from the EMIm-family in a state-of-the-art carbonate solvent based electrolyte is studied with a focus on safety improvement. The impact of the composition on physical and safety related properties is investigated for IL concentrations of additive (similar to 5 wt%) up to co-solvent concentrations (similar to 60 wt%). Furthermore, the role of the lithium salt concentration is separately addressed by studying a set of electrolytes at 0.5 M, 1 M, and 2 M LiPF6 concentrations. A large impact on the electrolyte properties is found for the electrolytes containing EMImTFSI and high salt concentrations. The composition 2 M LiPF6 EC:DEC:IL (1:1:3 wt%) is found non-flammable for both choices of ILs added. The macroscopic observations are complemented by a Raman spectroscopy analysis whereby a change in the Li+ solvation is detected for IL concentrations >4.5 mol%.

Ionic liquids

Safety

Lithium ion battery

Raman spectroscopy

Flammability

Författare

Susanne Wilken

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Shizhao Xiong

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Johan Scheers

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Per Jacobsson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Patrik Johansson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Journal of Power Sources

0378-7753 (ISSN)

Vol. 275 935-942

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

Energi

Materialvetenskap

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

Ämneskategorier

Materialkemi

DOI

10.1016/j.jpowsour.2014.11.071