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Journal Article

High Lithium Transference Number Electrolytes Containing Tetratriflylpropene's Lithium Salt


Maier,  J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Popovic, J., Höfler, D., Melchior, J. P., Münchinger, A., List, B., & Maier, J. (2018). High Lithium Transference Number Electrolytes Containing Tetratriflylpropene's Lithium Salt. The Journal of Physical Chemistry Letters, 9(17), 5116-5120.

Cite as: https://hdl.handle.net/21.11116/0000-000E-DDBA-8
Electrolytes with a high lithium transference number linked with high ionic conductivity are urgently needed for high power battery operation. In this work, we present newly synthesized lithium tetra(trifluoromethane-sulfonyl)propene as a salt-in-glyme-based "salt-in-solvent" electrolyte. We employ impedance spectroscopy in symmetric Li/electrolyte/Li cells and pulsed field gradient nuclear magnetic resonance spectroscopy to investigate the lithium conduction mechanism. We find predominant lithium conductivity with very high lithium transference numbers (similar to 70% from the polarization experiments) and three times higher ionic conductivity compared to well-known lithium triflate in diglyme electrolyte. This is a consequence of the reduced mobilities of large anions linked with improved ionic dissociation.