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Nanomaterials 2018, 8(6), 435; https://doi.org/10.3390/nano8060435

Gelled Electrolyte Containing Phosphonium Ionic Liquids for Lithium-Ion Batteries

1
Université de Lyon, F-69003, Lyon, France
2
INSA Lyon, F-69621 Villeurbanne, France
3
CNRS, UMR 5223, Ingénierie des Matériaux Polymères, F-69621 Villeurbanne, France
4
Université Grenoble Alpes, CEA-Grenoble, LITEN/DEHT/SCGE/LGI, 17, F-38000 Grenoble, France
5
Université Grenoble Alpes, CEA-Grenoble, INAC/SCIB/LRM, F-38000 Grenoble, France
*
Author to whom correspondence should be addressed.
Received: 16 May 2018 / Revised: 11 June 2018 / Accepted: 12 June 2018 / Published: 14 June 2018
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Abstract

In this work, new gelled electrolytes were prepared based on a mixture containing phosphonium ionic liquid (IL) composed of trihexyl(tetradecyl)phosphonium cation combined with bis(trifluoromethane)sulfonimide [TFSI] counter anions and lithium salt, confined in a host network made from an epoxy prepolymer and amine hardener. We have demonstrated that the addition of electrolyte plays a key role on the kinetics of polymerization but also on the final properties of epoxy networks, especially thermal, thermo-mechanical, transport, and electrochemical properties. Thus, polymer electrolytes with excellent thermal stability (>300 °C) combined with good thermo-mechanical properties have been prepared. In addition, an ionic conductivity of 0.13 Ms·cm−1 at 100 °C was reached. Its electrochemical stability was 3.95 V vs. Li0/Li+ and the assembled cell consisting in Li|LiFePO4 exhibited stable cycle properties even after 30 cycles. These results highlight a promising gelled electrolyte for future lithium ion batteries. View Full-Text
Keywords: ionic liquids; thermosets; Lithium salts; electrolytes ionic liquids; thermosets; Lithium salts; electrolytes
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Leclère, M.; Bernard, L.; Livi, S.; Bardet, M.; Guillermo, A.; Picard, L.; Duchet-Rumeau, J. Gelled Electrolyte Containing Phosphonium Ionic Liquids for Lithium-Ion Batteries. Nanomaterials 2018, 8, 435.

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