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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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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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Intermolecular Forces03:13

Intermolecular Forces

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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 Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

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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.
In this solution, the primary...
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Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

63.2K
Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
63.2K
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.7K
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.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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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
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Enhanced ionic conductivity in block copolymer electrolytes through interfacial passivation using mixed ionic

Jaemin Min1, Suhyun Bae1, Daisuke Kawaguchi2

  • 1Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.

The Journal of Chemical Physics
|November 3, 2023
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Summary
This summary is machine-generated.

Introducing mixed ionic liquids into block copolymer electrolytes significantly boosts ionic conductivity. This strategy enhances ion transport for advanced solid-state polymer electrolytes.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Block copolymer electrolytes are crucial for solid-state energy storage.
  • Enhancing ionic conductivity in these materials is a key challenge.
  • Ionic liquids (ILs) offer potential for improved ion transport.

Purpose of the Study:

  • To develop a strategic approach for enhancing ionic conductivity in block copolymer electrolytes.
  • To investigate the effect of mixed ionic liquids with varying molar ratios on electrolyte properties.
  • To synthesize and characterize novel polymer matrices for improved ionic transport.

Main Methods:

  • Synthesis of poly(4-styrenesulfonate)-b-polymethylbutylene (SSMB) and poly(4-styrenesulfonyl (trifluoromethanesulfonyl)imide)-b-polymethylbutylene (STMB) polymer matrices.
  • Incorporation of mixed ionic liquids (imidazolium cation with BF4 or TFSI anions) into the polymer matrices.
  • Characterization of block copolymer electrolyte structures, interfacial properties, and ionic conductivity.

Main Results:

  • Both SSMB and STMB electrolytes with mixed ILs exhibited hexagonal cylindrical structures.
  • STMB electrolytes showed enhanced segregation strength due to strong Coulomb and hydrogen bonding interactions.
  • SSMB electrolytes demonstrated improved ionic conductivities, exceeding theoretical averages, due to effective ion diffusion and reduced ion trapping.

Conclusions:

  • The strategic use of mixed ionic liquids in block copolymer electrolytes can significantly enhance ionic conductivity.
  • The choice of polymer matrix and ionic liquid components critically influences interfacial properties and ion transport mechanisms.
  • This approach offers a promising pathway for the development of high-performance solid-state polymer electrolytes for energy applications.