Ionic Liquid Electrolytes for Safer Lithium Batteries: I. Investigation around Optimal Formulation. Issue 1 (1st January 2017)

• Record Type: Journal Article
• Authors: Moreno, M.; Simonetti, E.; Appetecchi, G. B.; Carewska, M.; Montanino, M.; Kim, G.-T.; Loeffler, N.; Passerini, S.
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 1(2017)
• Page Start: A6026
• Page End: A6031
• Publication Date: 2017-01-01
• Subjects: PYR13FSI -- Ionic liquid electrolyte mixtures -- PYR13TFSI; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0051701jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : In this paper we report on the investigation of ionic liquid-based electrolytes with enhanced characteristics. In particular, we have studied ternary mixtures based on the lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt and two ionic liquids sharing the same cation ( N -methyl- N -propyl pyrrolidinium, PYR13 ), but different anions, bis(trifluoromethanesulfonyl)imide (TFSI) and bis(fluorosulfonyl)imide (FSI). The LiTFSI-PYR13 TFSI-PYR13 FSI mixtures, found to be ionically dissociated, exhibit better ion transport properties (about 10 −3 S cm −1 at −20°C) with respect to similar ionic liquid electrolytes till reported in literature. An electrochemical stability window of 5 V is observed in carbon working electrodes. Preliminary battery tests confirm the good performance of these ternary electrolytes with high-voltage NMC cathodes and graphite anodes. Ionic liquid electrolyte mixtures, PYR13 TFSI, PYR13 FSI.