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Related Concept Videos

Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
Ionic Association01:28

Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
Debye–Huckel–Onsager Conductance Equation01:28

Debye–Huckel–Onsager Conductance Equation

The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect. According to this equation,...
Electrolytes: van't Hoff Factor03:08

Electrolytes: van't Hoff Factor

Colligative Properties of ElectrolytesThe colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one dissolved...
The Debye–Hückel Theory of Electrolyte Solutions01:27

The Debye–Hückel Theory of Electrolyte Solutions

The Debye–Hückel theory, established by Peter Debye and Erich Hückel in 1923, is a fundamental concept in physical chemistry. It provides an understanding of the behavior of strong electrolytes in solution, particularly explaining their deviations from ideal behavior.The theory is based on Coulombic interactions (the attraction or repulsion between charged particles) between ions in solution. In an ionic solution, oppositely charged ions tend to attract each other. This means that cations...
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

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.
In this solution, the primary cation—the calcium...

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Updated: Jul 3, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
05:33

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Understanding correlation effects for ion conduction in polymer electrolytes.

Arijit Maitra1, Andreas Heuer

  • 1Westfälische Wilhelms-Universität Münster, Institut für Physikalische Chemie, Corrensstrasse 30, 48149 Münster, Germany.

The Journal of Physical Chemistry. B
|July 19, 2008
PubMed
Summary
This summary is machine-generated.

Ionic correlations in polymer electrolytes hinder conductivity. All-atom simulations reveal these correlations and refine existing models, improving the estimation of ion dynamics and fractions.

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Published on: October 10, 2016

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Last Updated: Jul 3, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Published on: August 12, 2013

1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
06:56

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Published on: October 10, 2016

Area of Science:

  • Materials Science
  • Physical Chemistry
  • Computational Chemistry

Background:

  • Polymer electrolytes often show reduced ionic conductivity.
  • This reduction is attributed to cation-anion correlation effects.
  • Microscopically, transient ionic aggregates like ion-pairs and clusters cause these correlations.

Purpose of the Study:

  • To explore ionic correlations in a model polymer electrolyte.
  • To develop a refined phenomenological model for ionic correlations.
  • To improve the estimation of ion dynamics and fractions in polymer electrolytes.

Main Methods:

  • All-atom simulations of poly(ethylene oxide) and lithium iodide.
  • Construction of elementary functions to describe ion pair correlations.
  • Derivation from the Einstein-like equation for collective diffusivity.

Main Results:

  • Ionic correlations are explained through spatio-temporal functions.
  • Approximation parameters deviate from unity, indicating limitations in simplified models.
  • The extended model successfully estimates free and non-free ion dynamics and fractions.

Conclusions:

  • Correlation effects are crucial for understanding ionic conductivity in polymer electrolytes.
  • The refined phenomenological model offers a more accurate description than previous models.
  • Simulation-derived parameters provide insights into the complex nature of ionic correlations.