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Ionic Liquids in Lithium Battery Electrolytes: Composition versus Safety and Physical Properties

Susanne Wilken (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Shizhao Xiong (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Johan Scheers (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Per Jacobsson (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Patrik Johansson (Institutionen för teknisk fysik, Kondenserade materiens fysik)
Journal of Power Sources (0378-7753). Vol. 275 (2015), p. 935-942.
[Artikel, refereegranskad vetenskaplig]

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%.

Nyckelord: Lithium ion battery; Safety; Ionic liquids; Flammability; Raman spectroscopy

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Denna post skapades 2015-01-08. Senast ändrad 2016-09-14.
CPL Pubid: 210216


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Institutionen för teknisk fysik, Kondenserade materiens fysik (1900-2015)


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Chalmers infrastruktur

C3SE/SNIC (Chalmers Centre for Computational Science and Engineering)