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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

106
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

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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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The Debye–Hückel Theory of Electrolyte Solutions01:27

The Debye–Hückel Theory of Electrolyte Solutions

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The Debye–Hückel theory, established by Peter Debye and Erich Hückel in 1923, is a fundamental concept in physical chemistry. It provides an understanding of the behavior of strong electrolytes in solution, particularly explaining their deviations from ideal behavior.The theory is based on Coulombic interactions (the attraction or repulsion between charged particles) between ions in solution. In an ionic solution, oppositely charged ions tend to attract each other. This means...
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Ion Exchange01:17

Ion Exchange

1.5K
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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Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

3.0K
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.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Stabilizing electrodeposition in elastic solid electrolytes containing immobilized anions.

Mukul D Tikekar1, Lynden A Archer2, Donald L Koch2

  • 1Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, USA.

Science Advances
|July 26, 2016
PubMed
Summary

Stabilizing lithium battery electrodes involves immobilizing anions in the electrolyte to prevent dendrite formation. Moderate polymer-like elasticity in separators enhances stable metal electrodeposition, even at high current densities.

Keywords:
DendritesElectrodepositionLithium BatteriesMechanicsStability AnalysisStructured Electrolytes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Morphological instabilities and dendrite growth during metal electrodeposition pose significant challenges for lithium battery safety and rechargeability.
  • Current mitigation strategies focus on controlling ion transport within the electrolyte to manage electric fields at the electrode-solution interface.

Purpose of the Study:

  • To investigate the role of solid electrolyte elastic deformation in stabilizing metal electrodeposition.
  • To develop a theoretical framework combining separator elasticity and modified ion transport to predict deposition stability.
  • To evaluate the impact of immobilized anions and separator mechanical properties on planar deposition stability across various current densities.

Main Methods:

  • Theoretical analysis of ion transport and elastic deformation in solid electrolytes.
  • Modeling the interplay between separator elasticity and anion immobilization.
  • Evaluating stability criteria for planar metal deposition under different electrochemical conditions.

Main Results:

  • Immobilizing a fraction of anions within the electrolyte effectively reduces the electric field at the metal electrode, slowing instability growth.
  • Stable electrodeposition is achievable at relatively high current densities when using electrolytes/separators with moderate polymer-like mechanical moduli.
  • The combined effects of separator elasticity and modified transport significantly influence the stability of planar deposition.

Conclusions:

  • Moderate mechanical moduli in polymer-like separators, coupled with a small degree of anion immobilization, are effective in achieving stable metal electrodeposition.
  • This approach offers a promising strategy for enhancing the rechargeability and safety of lithium batteries by suppressing dendrite formation.