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Related Experiment Videos

High Lithium Transference Number Electrolytes Containing Tetratriflylpropene's Lithium Salt.

J Popovic1, D Höfler2, J P Melchior1

  • 1Max Planck Institute for Solid State Research , 70569 Stuttgart , Germany.

The Journal of Physical Chemistry Letters
|August 3, 2018
PubMed
Summary

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Newly synthesized lithium tetra(trifluoromethanesulfonyl)propene electrolytes offer high ionic conductivity and lithium transference numbers, crucial for advanced battery performance. This breakthrough enhances power capabilities in high-power battery applications.

Area of Science:

  • Electrochemistry
  • Materials Science

Background:

  • High power battery operation demands electrolytes with high lithium transference numbers and ionic conductivity.
  • Current electrolytes face limitations in achieving optimal performance for demanding applications.

Purpose of the Study:

  • To synthesize and characterize a novel "salt-in-solvent" electrolyte based on lithium tetra(trifluoromethanesulfonyl)propene in a glyme solvent.
  • To investigate the lithium ion conduction mechanism and evaluate its performance against established electrolytes.

Main Methods:

  • Impedance spectroscopy in symmetric Li/electrolyte/Li cells.
  • Pulsed field gradient nuclear magnetic resonance (PFG-NMR) spectroscopy.
  • Electrochemical performance evaluation and comparison with lithium triflate in diglyme.

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Main Results:

  • The newly synthesized electrolyte exhibits significantly higher ionic conductivity (three times) compared to lithium triflate in diglyme.
  • High lithium transference numbers (approximately 70%) were observed, indicating efficient lithium ion transport.
  • The enhanced performance is attributed to reduced anion mobility and improved ionic dissociation.

Conclusions:

  • Lithium tetra(trifluoromethanesulfonyl)propene represents a promising electrolyte material for high-power battery applications.
  • The "salt-in-solvent" approach with this novel salt offers a viable strategy for improving battery electrolytes.
  • Further research can explore optimization for commercial battery systems.