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Ion Exchange01:17

Ion Exchange

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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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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Ionic Association01:28

Ionic Association

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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.
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Ionic Bonds00:42

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.
Opposing Charges Hold Ions Together in Ionic Compounds
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Electrolytes: van't Hoff Factor03:08

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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...
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Ionic Bonding and Electron Transfer02:48

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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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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Solvation-Heterostructure Synergy Enables Reversible Four-Electron Conversion in High-Capacity Na-Ion Electrodes.

Cai Liu1, Peng Zhao1, Boyuan Liu1

  • 1Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, China.

Small (Weinheim an Der Bergstrasse, Germany)
|March 16, 2026
PubMed
Summary
This summary is machine-generated.

Solvation engineering with dimethoxyethane electrolytes enables reversible phase transitions in MoSe2 for high-capacity sodium-ion batteries. This strategy enhances kinetics and structural stability, improving overall device performance.

Keywords:
conversion reaction mechanismsconversion‐type anode MoSe2fast reaction kineticssolvation structuresolvent co‐intercalation/deintercalation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Conversion-type electrode materials for sodium-ion storage face challenges with slow kinetics and irreversible phase transitions.
  • Electrolyte solvation chemistry's role in mediating electrode phase evolution is an underexplored area.

Purpose of the Study:

  • To investigate the impact of electrolyte solvation chemistry on the phase transition dynamics of conversion-type MoSe2.
  • To develop a solvation engineering strategy for improved Na-ion storage performance.

Main Methods:

  • Utilized dimethoxyethane (DME)-based electrolytes for solvation engineering of MoSe2.
  • Systematically analyzed Na+ solvation structures and their influence on MoSe2 phase transitions.
  • Investigated the electrochemical performance of MoSe2-TiO2-MXene (MTM) anodes.

Main Results:

  • Tailored Na+-2DME solvation structures eliminated desolvation barriers, enabling direct co-intercalation.
  • Accelerated interfacial charge transfer and reduced electrolyte decomposition were observed.
  • Solvation-induced lattice expansion alleviated mechanical strain, preserving structural integrity and ion diffusion.
  • A four-electron transfer process was achieved in MTM anodes, demonstrating high reversibility.

Conclusions:

  • Solvation engineering is a viable strategy to control phase transition thermodynamics and kinetics in conversion electrodes.
  • This approach offers universal design principles for high-performance Na-ion storage devices.