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The Intriguing Properties of 1-Ethyl-3-methylimidazolium bis(fluorosulfonyl)imide Ionic Liquid

  • S. Sayah
  • F. Ghamouss
  • J. Santos-Peña
  • F. Tran-Van
  • D. Lemordant
Article
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Abstract

Among all ionic liquids (ILs) which can be used as electrolyte solvents in Li-ion batteries (LIB), 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide, [C2mim][FSI], is certainly the most noteworthy. One reason for that is driven by its exceptionally low viscosity, which enhances its intrinsic conductivity and makes it a good solvent for the formulation of safer electrolytes in LIB in comparison with classical organic solvents. The solubility of lithium salts in [C2mim][FSI] can be very high (more than 4 mol·L−1 for LiFSI), which opens the field to the use highly concentrated electrolyte solutions containing only ions. With the aim of comparing the physico-chemical properties of different FSI based ILs and the electrolytes obtained by addition of a doping Li-salt, three [FSI] based ILs were selected: [C2mim][FSI], N-propyl-N-methyl pyrrolidinium bis(fluorosulfonyl)imide [C3mpyrr][FSI] and N-butyl-N-methyl pyrrolidinium bis(fluorosulfonyl)imide [C4mpyrr][FSI]. For comparison, a TFSI based IL ([C4mpyrr][TFSI]) and a reference alkylcarbonate mixture (ethylcarbonate (EC)/propylcarbonate (PC)/dimethylcarbonate (DMC) (in the proportion 1/1/3 by weight) are also studied. LiFSI or lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) were used as doping lithium salts. The following physico-chemical properties have been investigated: density, viscosity, ionic conductivity, ionicity and transference number. From these results, it can be concluded that all [FSI] based ILs considered in this work exhibit both a relatively low viscosity, a high conductivity, a high ionicity and Li-ion transference number. All these properties make them good candidates for use as electrolyte in Li-ion batteries. Moreover their great thermal stability and low flammability give them an advantage over classical organic solvents.

Keywords

Ionic liquid 1-Ethyl-3-methylimidazolium bis(fluorosulfonyl)imide Electrolyte Viscosity Ionic conductivity Transference number 

Notes

Acknowledgements

Support for this study was provided by the French research national agency (ANR) under the program PROGELEC (2013) and the project “Development of NEW Si-based Nanocomposite Materials with Stabilized Surface for Negative Electrodes of Li-ion batteries (Newmaste). We wish also to thank Dr. Catherine Santini (CPE, Lyon) for helpful discussions.

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Université de ToursToursFrance

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