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Poly(ionic liquid) Based Composite Electrolytes for Lithium Ion Batteries

Löwe, Robert; Hanemann, Thomas; Zinkevich, Tatiana; Hofmann, Andreas


Polymerized ionic liquids (PIL) are an interesting substance class, which is discussed to transfer the outstanding properties and tunability of ionic liquids into a solid material. In this study we extend our previous research on ammonium based PIL and discuss the influence of additives and their usability as polymer electrolyte membranes for lithium ion batteries. The polymer electrolyte is thereby used as replacement for the commercially widespread system of a separator that is soaked with liquid electrolyte. The influence of the material composition on the ionic conductivity (via electrochemical impedance spectroscopy) and the diffusion coefficients (via pulsed-field-gradient nuclear magnetic resonance spectroscopy) were studied and cell tests with adapted membrane materials were performed. High amounts of the additional ionic liquid (IL) MPPyrr-TFSI (1-methyl-1-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide) increased the ionic conductivity of the materials up to 1.3·10−4 S·cm−1 but made the usage of a cross-linker necessary to obtain mechanically stable membranes. The application of liquid electrolyte mixtures with ethylene carbonate (EC) and MPPyrr-TFSI decreased ionic conductivity values down to the 10−9 S·cm−1 range, but increased 7Li diffusion coefficients with increasing amounts of EC up to 1.7·10−10 m2·s−1. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000141697
Veröffentlicht am 29.01.2022
DOI: 10.3390/polym13244469
Zitationen: 4
Web of Science
Zitationen: 3
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Post Lithium Storage (POLiS)
Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2073-4360
KITopen-ID: 1000141697
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Polymers
Verlag MDPI
Band 13
Heft 24
Seiten Article no: 4469
Projektinformation EXC 2154/1; POLiS (DFG, DFG EXSTRAT, EXC 2154/1_I)
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 20.12.2021
Schlagwörter lithium ion batteries; polymerizable ionic liquids; poly(ionic liquid)s; composite polymer electrolytes; ionogel electrolyte; lithium diffusion; PFG-NMR; MPPyrr-TFSI; EC
Nachgewiesen in Dimensions
Web of Science
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