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Related Concept Videos

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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.
Transport Number01:31

Transport Number

The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...
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.
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...
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...
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...

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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

Enhanced lithium transference numbers in ionic liquid electrolytes.

T Frömling1, M Kunze, M Schönhoff

  • 1Fachbereich Chemie, Physikalische Chemie, Philipps-Universitat Marburg, Hans-Meerwein-Strasse, Marburg, Germany.

The Journal of Physical Chemistry. B
|September 20, 2008
PubMed
Summary
This summary is machine-generated.

This study characterizes ion transport in N-butyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide (BMP-TFSI) and lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) mixtures. Results show a higher apparent lithium transference number, suggesting improved electrolyte performance for lithium-ion batteries.

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions

Published on: October 10, 2016

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
06:56

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

Published on: October 10, 2016

Area of Science:

  • Electrochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Ionic liquids (ILs) are promising electrolytes for advanced energy storage devices.
  • Optimizing ion transport properties, particularly lithium-ion mobility and transference, is crucial for enhancing device performance.
  • Mixtures of N-butyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide (BMP-TFSI) and lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) are explored as potential electrolyte systems.

Purpose of the Study:

  • To characterize the ion transport mechanisms in BMP-TFSI/Li-TFSI mixtures.
  • To determine the influence of Li-TFSI concentration on ionic conductivity, diffusion coefficients, and transference numbers.
  • To identify strategies for improving the apparent lithium transference number in these IL electrolytes.

Main Methods:

  • Ac impedance spectroscopy was employed to measure bulk ionic conductivity.
  • Pulsed field gradient nuclear magnetic resonance (PFG-NMR) was used to determine individual cation and anion diffusion coefficients.
  • Haven ratio and apparent lithium transference numbers were calculated from conductivity and diffusion data.

Main Results:

  • Stable BMP-TFSI/Li-TFSI mixtures were achieved at molar ratios up to x = 0.377 without crystallization.
  • The Haven ratio values were consistent with typical ionic liquid electrolytes.
  • A maximal apparent lithium transference number was observed, exceeding values reported in other recent studies.

Conclusions:

  • The BMP-TFSI/Li-TFSI system demonstrates favorable ion transport characteristics for lithium-ion applications.
  • The achieved lithium transference numbers suggest potential for improved battery performance.
  • Further research can focus on optimizing electrolyte composition and structure to further enhance lithium-ion transport and battery efficiency.