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Related Concept Videos

Ionic Radii03:10

Ionic Radii

33.9K
Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
33.9K
Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

68.4K
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
68.4K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

50.1K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
50.1K
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

72.3K
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.
72.3K
Electrolytes: van't Hoff Factor03:08

Electrolytes: van't Hoff Factor

37.2K
Colligative Properties of Electrolytes
The 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...
37.2K
Ionic Crystal Structures02:42

Ionic Crystal Structures

18.1K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
18.1K

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Connection between Lithium Coordination and Lithium Diffusion in [Pyr12O1 ][FTFSI] Ionic Liquid Electrolytes.

Guinevere A Giffin1,2,3, Arianna Moretti1,2, Sangsik Jeong1,2

  • 1Helmholtz-Institute Ulm (HIU), Helmholtzstrasse 11, 89081, Ulm, Germany.

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Summary

Highly concentrated ionic liquid electrolytes enhance lithium-ion battery performance by improving ion transport. Higher concentrations promote larger lithium-ion complexes, boosting rate capability and capacity retention.

Keywords:
batteriesdensity functional calculationselectrolytesionic liquidslithium diffusion

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Ionic liquid-based electrolytes offer potential advantages for lithium-ion and lithium-metal batteries.
  • Electrolyte concentration significantly impacts ion transport mechanisms and battery performance.
  • Understanding the relationship between bulk properties and molecular organization is crucial for electrolyte design.

Purpose of the Study:

  • To investigate the correlation between ionic liquid electrolyte concentration, molecular structure, and lithium-ion transport mechanisms.
  • To elucidate how electrolyte properties influence rate capability and capacity retention in lithium-ion cells.
  • To identify the optimal concentration range for enhanced lithium-ion battery performance.

Main Methods:

  • Analysis of bulk electrolyte properties, including viscosity and conductivity.
  • Investigation of molecular organization and lithium-ion species distribution.
  • Correlation of electrolyte characteristics with electrochemical performance metrics like rate capability and capacity retention.

Main Results:

  • Highly concentrated ionic liquid electrolytes (above 30 mol%) exhibit improved rate capability and capacity retention at 20°C compared to dilute systems.
  • In concentrated electrolytes, lithium-ion transport shifts from primarily vehicular diffusion to a mechanism favoring structural diffusion.
  • The presence of larger lithium-ion complexes in concentrated electrolytes enhances lithium-ion transport and availability at the electrode.

Conclusions:

  • Electrolyte concentration is a critical factor in optimizing lithium-ion battery performance.
  • The shift in Li+ transport mechanisms in concentrated ionic liquid electrolytes is key to improved electrochemical performance.
  • Designing electrolytes with specific molecular organizations can enhance lithium-ion transport and battery efficiency.