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Conductivity, viscosity, and dissolution enthalpy of LiNTF2 in ionic liquid BMINTF2
Angelo Andriola1, Kulwinder Singh, James Lewis
1Department of Chemistry and Biochemistry, Rowan University, Glassboro, New Jersey 08028, USA.
The Journal of Physical Chemistry. B
|August 26, 2010
Summary
Adding lithium or sodium salts to the ionic liquid BMINTF(2) decreased conductivity and increased viscosity. Dissolution was exothermic, suggesting Li(+) may form complexes with NTF(2)(-) anions.
Area of Science:
- Electrochemistry
- Materials Science
- Physical Chemistry
Background:
- Ionic liquids (ILs) are promising electrolytes for electrochemical applications.
- Understanding ion transport properties in ILs is crucial for electrolyte design.
- Lithium (Li) and sodium (Na) salts are key components in battery electrolytes.
Purpose of the Study:
- To investigate the effect of LiNTF(2) and NaNTF(2) salts on the properties of the ionic liquid BMINTF(2).
- To determine the ionic conductivity, relative viscosity, and solution enthalpy of these mixtures.
- To elucidate the ion-solvation behavior in BMINTF(2)-based electrolytes.
Main Methods:
- Measurement of ionic conductivity using electrochemical techniques.
- Determination of relative viscosity through viscometry.
- Calculation of solution enthalpy via solution calorimetry.
Main Results:
- Ionic conductivity decreased upon addition of LiNTF(2) and NaNTF(2) to BMINTF(2).
- Relative viscosity increased significantly with increasing salt concentrations.
- The dissolution process was found to be exothermic, with a solution enthalpy of approximately -18.07 ± 4.61 kJ/mol.
Conclusions:
- The addition of LiNTF(2) and NaNTF(2) negatively impacts ion transport in BMINTF(2).
- Exothermic dissolution suggests favorable interactions between salts and the ionic liquid.
- Evidence suggests Li(+) ions may form complexes with multiple NTF(2)(-) anions, influencing solution properties.
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