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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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Theory of Strong Electrolytes01:23

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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...
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Ionic Association01:28

Ionic Association

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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.
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Roles of Electrolytes: Sodium and Potassium01:24

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Sodium plays a crucial role in maintaining fluid and electrolyte balance and overall bodily homeostasis. Sodium balance is primarily regulated by kidney function, which adjusts sodium elimination to match dietary intake and maintain proper electrolyte levels. Sodium is the most abundant cation in the extracellular fluid (ECF) and is found in salts such as sodium chloride (NaCl) and sodium bicarbonate (NaHCO3). Although cellular plasma membranes are relatively impermeable to sodium, its role in...
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Electrolyte Covalent Organic Frameworks for Exceptional Potassium Ion Conduction.

Shanshan Tao1, Hao Yang1, Ruoyang Liu1

  • 1Department of Chemistry, Faculty of Science, National University of Singapore, Singapore.

Angewandte Chemie (International Ed. in English)
|April 17, 2026
PubMed
Summary

We developed novel electrolyte covalent organic frameworks for efficient potassium ion conduction. These materials exhibit high conductivity and low activation energy, promising for advanced energy storage devices.

Keywords:
1D channelsacceleration effectactivation energycovalent organic frameworkspotassium ion conduction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Potassium ion conduction is crucial for next-generation energy storage.
  • Developing efficient solid-state electrolytes remains a challenge.

Purpose of the Study:

  • To introduce electrolyte covalent organic frameworks (ECOFs) for high-rate, low-activation-energy potassium ion conduction.
  • To investigate the relationship between framework structure and ion transport properties.

Main Methods:

  • One-pot polymerization of monomers with oligo(ethylene oxide) chains to create crystalline porous frameworks.
  • Integration of potassium salts into the framework pores to form ion-electrolyte networks.
  • Electrochemical characterization of ion conductivity and activation energy under varying conditions.

Main Results:

  • Frameworks with well-developed electrolyte interfaces demonstrated significantly enhanced ion conductivity.
  • Achieved ion conductivity of 3.2 × 10-3 S cm-1 (0.2 eV activation energy) under anhydrous conditions.
  • Under humid conditions, conductivity increased to 2.1 × 10-1 S cm-1 (0.04 eV activation energy), indicating near-frictionless ion transport.
  • Potassium ion batteries exhibited a stable -6 to 6 V voltage window and a high transference number (0.76).

Conclusions:

  • Molecular design of electrolyte frameworks enables exceptional potassium ion conduction.
  • ECOFs show significant promise for solid-state and aqueous energy storage applications.