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Int. J. Mol. Sci. 2014, 15(8), 14868-14890; doi:10.3390/ijms150814868

Separators for Li-Ion and Li-Metal Battery Including Ionic Liquid Based Electrolytes Based on the TFSI and FSI Anions

1
Institute of Physical Chemistry, University of Muenster, Corrensstraβe 28-30, Muenster 48149, Germany
2
Helmholtz Institute Ulm, Electrochemical Energy Storage, Albert-Einstein-Allee 11, 89081 Ulm, Germany and Karlsruhe Institute of Technology PO Box 3640, Karlsruhe 76021, Germany
*
Authors to whom correspondence should be addressed.
Received: 24 May 2014 / Revised: 27 June 2014 / Accepted: 8 July 2014 / Published: 22 August 2014
(This article belongs to the Special Issue Ionic Liquids 2014 & Selected Papers from ILMAT 2013)
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Abstract

The characterization of separators for Li-ion or Li-metal batteries incorporating hydrophobic ionic liquid electrolytes is reported herein. Ionic liquids made of N-butyl-N-methylpyrrolidinium (PYR14+) or N-methoxyethyl-N-methylpyrrolidinium (PYR12O1+), paired with bis(trifluoromethanesulfonyl)imide (TFSI) or bis(fluorosulfonyl)imide (FSI) anions, were tested in combination with separators having different chemistries and morphologies in terms of wetting behavior, Gurley and McMullin number, as well as Li/(Separator + Electrolyte) interfacial properties. It is shown that non-functionalized microporous polyolefin separators are poorly wetted by FSI-based electrolytes (contrary to TFSI-based electrolytes), while the ceramic coated separator Separion® allows good wetting with all electrolytes. Furthermore, by comparing the lithium solid electrolyte interphase (SEI) resistance evolution at open circuit and during cycling, depending on separator morphologies and chemistries, it is possible to propose a scale for SEI forming properties in the order: PYR12O1FSI > PYR14FSI > PYR14TFSI > PYR12O1TFSI. Finally, the impact the separator morphology is evidenced by the SEI resistance evolution and by comparing Li electrodes cycled using separators with two different morphologies. View Full-Text
Keywords: ionic liquids; lithium metal; separator; Li-ion ionic liquids; lithium metal; separator; Li-ion
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Kirchhöfer, M.; von Zamory, J.; Paillard, E.; Passerini, S. Separators for Li-Ion and Li-Metal Battery Including Ionic Liquid Based Electrolytes Based on the TFSI and FSI Anions. Int. J. Mol. Sci. 2014, 15, 14868-14890.

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