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Related Concept Videos

Ionic Strength: Overview01:12

Ionic Strength: Overview

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The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
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Colligative Properties of Electrolytes
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
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Dynamic Electrochemical Measurement of Chloride Ions
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Overdetermination method for accurate dynamic ion correlations in highly concentrated electrolytes.

Tabita Pothmann1, Maleen Middendorf2,3, Christian Gerken1

  • 1Department of Chemistry and Center for Materials Science (WZMW), University of Marburg, Hans-Meerwein-Strasse 4, 35032 Marburg, Germany. roling@staff.uni-marburg.de.

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Summary

Determining battery electrolyte transport properties requires overdetermined measurements. Five experimental quantities, not four, yield acceptable uncertainties for Onsager coefficients and thermodynamic factors in concentrated electrolytes.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Highly concentrated battery electrolytes offer enhanced safety and stability.
  • Ion transport properties are crucial for battery performance and influenced by ion correlation.
  • Accurate determination of transport parameters like Onsager coefficients and thermodynamic factors is essential.

Purpose of the Study:

  • To investigate the minimum experimental data required for accurate characterization of transport properties in concentrated electrolytes.
  • To compare the uncertainties in Onsager coefficients and thermodynamic factors obtained from different numbers of experimental measurements.
  • To evaluate the impact of overdetermination on the reliability of electrolyte transport property analysis.

Main Methods:

  • Combined electrochemical impedance spectroscopy, electrophoretic NMR, and concentration cell measurements.
  • Characterized two highly concentrated sulfolane/LiFSI electrolytes.
  • Compared results from sets of four and five experimental quantities.

Main Results:

  • Methods using only four experimental quantities resulted in large uncertainties for either Onsager coefficients or the thermodynamic factor.
  • Overdetermination with five experimental quantities provided acceptable uncertainties for all four target quantities.
  • Analysis revealed insights into dynamic ion correlations and transport limitations.

Conclusions:

  • Accurate determination of battery electrolyte transport properties necessitates overdetermined experimental data.
  • Five experimental measurements are crucial for reliable quantification of Onsager coefficients and thermodynamic factors.
  • This study highlights the importance of experimental design for understanding ion dynamics in advanced battery electrolytes.