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Related Concept Videos

Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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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.
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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.
In this solution, the primary...
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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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Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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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.
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Poly(Ionic Liquid) Electrolytes at an Extreme Salt Concentration for Solid-State Batteries.

Shinji Kondou1,2,3,4, Mohanad Abdullah5, Ivan Popov6

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Researchers developed advanced polymer-in-salt electrolytes using cationic poly(ionic liquids) and asymmetric anions. This innovation enables high salt concentrations, enhancing ionic conductivity and stability for better battery performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Polymer-in-salt electrolytes aim to improve Li-ion conductivity in solid-state batteries.
  • Challenges include maintaining salt stability and high conductivity within the polymer matrix.
  • Fundamental understanding of high salt concentration effects is limited.

Purpose of the Study:

  • To develop a stable polymer-in-salt electrolyte with exceptionally high salt content.
  • To investigate the impact of extreme salt concentrations on electrolyte properties.
  • To enhance understanding of ion transport mechanisms in polymer electrolytes.

Main Methods:

  • Integration of cationic poly(ionic liquids) (polyIL) with crystallization-resistive salts featuring asymmetric anions.
  • Fabrication of polymer-in-salt electrolytes with up to 90 mol % Li-salt content.
  • Analysis of coordination structures, glass transitions, ionic conductivity, and ion transport dynamics.

Main Results:

  • Achieved a stable polymer-in-salt electrolyte with up to 90 mol % Li-salt.
  • Demonstrated enhanced ionic conductivity at high salt concentrations.
  • Elucidated the relationship between salt concentration, structural dynamics, and ion transport.

Conclusions:

  • The developed polyIL-based polymer-in-salt electrolytes offer a promising pathway for high-performance solid-state batteries.
  • Understanding the effects of high salt loading is crucial for optimizing electrolyte design.
  • This research provides critical insights for future development of advanced polymer electrolytes.