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Ionic liquid electrolytes for safer lithium batteries I. investigation around optimal formulation

TitleIonic liquid electrolytes for safer lithium batteries I. investigation around optimal formulation
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2017
AuthorsMoreno, M., Simonetti E., Appetecchi Giovanni Battista, Carewska M., Montanino M., Kim G.-T., Loeffler N., and Passerini S.
JournalJournal of the Electrochemical Society
KeywordsBis(fluorosulfonyl)imide, Bis(trifluoromethane sulfonyl)imide, carbon, Electric batteries, Electrochemical stabilities, Electrodes, Electrolytes, Ion-transport properties, Ionic liquid electrolytes, Ionic liquids, Ionic-liquid based electrolytes, Liquids, Lithium-ion batteries, Mixtures, Optimal formulation, Working electrode

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, PYR 13 ), but different anions, bis(trifluoromethanesulfonyl)imide (TFSI) and bis(fluorosulfonyl)imide (FSI). The LiTFSI-PYR13TFSI-PYR 13 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, PYR13TFSI, PYR13FSI. © The Author(s) 2016. Published by ECS.


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Citation KeyMoreno2017A6026