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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

454
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Ionic Bonds00:42

Ionic Bonds

119.5K
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
Ionic bonds are reversible electrostatic interactions between ions...
119.5K
Molecular and Ionic Solids02:54

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.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

42.0K
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. 
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Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

63.6K
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.
63.6K
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

1.6K
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...
1.6K

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Updated: Aug 24, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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Probing the Mechanically Stable Solid Electrolyte Interphase and the Implications in Design Strategies.

Yao Gao1, Biao Zhang1

  • 1Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China.

Advanced Materials (Deerfield Beach, Fla.)
|October 25, 2022
PubMed
Summary

The mechanical properties of the solid electrolyte interphase (SEI) are crucial for secondary battery performance. This study outlines methods to improve SEI mechanical stability for enhanced battery cycling.

Keywords:
atomic force microscopychemical compositionmechanical propertiessolid electrolyte interphasestructure

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Mechanical Engineering

Background:

  • Secondary battery anode volume expansion during cycling stresses the solid electrolyte interphase (SEI).
  • SEI mechanical integrity is critical for battery performance but difficult to assess due to its complex, nanoscale nature.
  • Lack of consensus on SEI mechanical properties hinders the development of stable battery designs.

Purpose of the Study:

  • To review essential SEI mechanical properties and characterization methods.
  • To identify challenges and inconsistencies in current SEI mechanical testing and optimization strategies.
  • To propose research protocols for improving SEI mechanical stability and battery cycling performance.

Main Methods:

  • Literature review of SEI mechanical properties and characterization techniques.
  • Analysis of existing studies on SEI mechanical optimization for battery performance.
  • Identification of key factors affecting SEI mechanical behavior and testing accuracy.

Main Results:

  • Essential and desirable mechanical properties of SEI are defined.
  • Various mechanical characterization methods are discussed, highlighting accuracy considerations.
  • Inconsistencies in previous SEI optimization attempts are analyzed, with underlying causes explored.

Conclusions:

  • Standardized protocols are needed for accurate SEI mechanical characterization.
  • Improving SEI mechanical stability is key to achieving superior battery cycling performance.
  • Further research is required to bridge the gap between fundamental understanding and practical application.