An advanced ionic liquid-lithium salt electrolyte mixture based on the bis(fluoromethanesulfonyl)imide anion

• Published in: Electrochemistry communications Vol. 43; pp. 5 - 8
• Main Authors: Deguchi, Y., Serra Moreno, J., Panero, S., Scrosati, B., Ohno, H., Appetecchi, G.B.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01-06-2014; Amsterdam Elsevier; New York, NY
• Subjects: Bis(fluorosulfonyl)imide; Bis(trifluoromethanesulfonyl)imide; Chemistry; Electrochemistry; Exact sciences and technology; General and physical chemistry; Ionic liquid electrolytes; N-butyl-N-ethylpyrrolidinium; Properties of electrolytes: conductivity; Bis(fluorosulfonyl)imide; N-butyl-N-ethylpyrrolidinium; Bis(trifluoromethanesulfonyl)imide; Ionic liquid electrolytes; Lithium ion batteries; Differential scanning calorimetry; Electrical properties; Electrolyte solution; Ionic conductivity; Temperature effect; Secondary cell; Glass transition temperature; Mixture; Operating conditions; Ionic liquid; Bis(trilfuoromethanesulfonyl)imide; Thermal analysis; Melting point; Physicochemical properties
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/j.elecom.2014.02.017

An innovative electrolyte mixture, based on the novel N-butyl-N-ethylpyrrolidinium bis(fluoromethanesulfonyl)imide (PYR24FSI) ionic liquid and the LiFSI lithium salt, was prepared and its thermal and ion-transport properties were investigated. The FSI-based mixture showed fast crystallization kinetics with melting point around −40°C. A conductivity close to 4×10−3Scm−1 was reached at room temperature. This PYR24FSI-LiFSI mixture family has been found to be an appealing electrolyte for high safety and performance lithium battery systems.
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•A novel PYR24FSI-LiFSI mixture was prepared.•The mixture melts near −40°C with a room temperature conductivity close to 4×10−3Scm−1.•The PYR24FSI-LiFSI mixture is an appealing electrolyte for lithium battery systems.