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Ionic Liquid Electrolytes for Safer Lithium Batteries – I. Investigation around Optimal Formulation

Moreno, M.; Simonetti, E.; Appetecchi, G. B.; Carewska, M.; Montanino, M.; Kim, G.-T.; Loeffler, N.; Passerini, S.

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-PYR13TFSI-PYR13FSI 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.

Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1149/2.0051701jes
ISSN: 0013-4651, 1945-7111, 0096-4743, 0096-4786
KITopen ID: 1000067042
HGF-Programm 37.01.01; LK 01
Erschienen in Journal of the Electrochemical Society
Band 164
Heft 1
Seiten A6026–A6031
Lizenz CC BY-NC-ND 4.0: Creative Commons Namensnennung – Nicht kommerziell – Keine Bearbeitungen 4.0 International
Schlagworte Ionic liquid electrolyte mixtures; PYR13TFSI; PYR13FSI
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