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Related Experiment Videos

Negative effective Li transference numbers in Li salt/ionic liquid mixtures: does Li drift in the "Wrong" direction?

M Gouverneur1, F Schmidt, M Schönhoff

  • 1Institute of Physical Chemistry, University of Muenster, Correnstraße 28/30, 48149 Münster, Germany. schoenho@uni-muenster.de.

Physical Chemistry Chemical Physics : PCCP
|March 2, 2018
PubMed
Summary

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Lithium ions in ionic liquids move with anions, forming charged clusters. This correlated motion impacts lithium-ion battery conductivity and transport mechanisms.

Area of Science:

  • Electrochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Ionic liquids are promising electrolytes for lithium-ion batteries.
  • Understanding ion transport mechanisms is crucial for battery performance.

Purpose of the Study:

  • To investigate the ion transport mechanisms in lithium salt/ionic liquid mixtures.
  • To determine the effective transference numbers of lithium ions.

Main Methods:

  • Utilized 1H, 19F, and 7Li electrophoretic NMR.
  • Measured electrophoretic mobilities of ion species.

Main Results:

  • Observed correlated motion of lithium ions with anions (TFSA- or BF4-).
  • Identified negatively charged lithium-containing clusters ([Li(TFSA)2]- or [Li(BF4)3]2-).

Related Experiment Videos

  • Determined negative effective transference numbers for lithium ions (-0.04 to -0.02).

    • Conclusions:

    • Lithium ion transport in these ionic liquids is dominated by cluster formation and vehicular transport.
    • Negative transference numbers indicate a significant contribution of anion-correlated motion to lithium transport.
    • Findings have implications for optimizing lithium-ion battery electrolytes and understanding mass transport.