Abstract
Herein, the N-butyl-N-methylpyrrolidinium bis(fluorosulfonyl)amide and the N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)amide room temperature ionic liquids, combined with the lithium bis(trifluoromethanesulfonyl)amide salt, are investigated as electrolytes for Li/LiNi1/3Mn1/3Co1/3O2 (Li/NMC) batteries. To conduct this study, volumetric properties, ionic conductivity and viscosity of the pure ionic liquids and selected electrolytes were firstly determined as a function of temperature and composition in solution. These data were then compared with those measured in the case of the standard alkyl carbonate-based electrolyte: e.g. the EC/PC/3DMC + 1 mol·L−1 LiPF6. The compatibility of the selected electrolytes with the lithium electrode was then investigated by following the evolution of Li/electrolyte interfaces through impedance measurements. Interestingly, the impedances of the investigated Li/electrolyte interfaces were found to be more than three times lower than that measured using the standard electrolyte. Finally, electrochemical performances of the ionic liquid-based electrolytes were investigated using galvanostatic charge and discharge and cyclic voltammetry of each Li/NMC cell. Using these electrolytes, each tested Li cell reaches up to 145 mA·h·g−1 at C/10 and 110 mA·h·g−1 at C with a coulombic efficiency close to 100 %.
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Acknowledgments
Financial supports received from STMicroelectronics and from the APR Blades Project (Région Centre) are gratefully acknowledged. The authors would also like to thank E. Luais for fruitful discussions and M. Bouziani Idrissi for his help during the sample and batteries preparations.
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The authors declare no competing financial interest.
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Chaudoy, V., Ghamouss, F., Jacquemin, J. et al. On the Performances of Ionic Liquid-Based Electrolytes for Li-NMC Batteries. J Solution Chem 44, 769–789 (2015). https://doi.org/10.1007/s10953-015-0315-3
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DOI: https://doi.org/10.1007/s10953-015-0315-3