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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

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...
Qualitative Analysis03:46

Qualitative Analysis

For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
Common Ion Effect03:24

Common Ion Effect

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

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 cation—the calcium...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

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Intercalation-Induced Amorphization Boosts Aqueous Magnesium-Ion Storage.

Tongxin Zhou1, Divakar Arumugam1, A M Milinda Abeykoon2

  • 1Department of Chemical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts 01609, United States.

Chemistry of Materials : a Publication of the American Chemical Society
|May 18, 2026
PubMed
Summary
This summary is machine-generated.

Aqueous battery cathode materials can store divalent magnesium ions (Mg2+) through an intercalation-induced amorphization process in vanadate electrodes. This reversible structural change enhances ion transport and offers a new design strategy for advanced batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Designing aqueous battery cathode materials for efficient divalent ion storage (e.g., Mg2+) is crucial for developing high-capacity, reversible energy storage systems.
  • Intercalation-induced structural changes in electrode materials significantly impact ion transport and overall battery performance.

Purpose of the Study:

  • To investigate the mechanism of divalent Mg2+ storage in vanadate electrode materials.
  • To explore the relationship between ion intercalation and reversible structural transformations in aqueous batteries.

Main Methods:

  • In situ synchrotron X-ray diffraction and absorption spectroscopy to monitor structural changes during Mg2+ intercalation/deintercalation.
  • Electrokinetic analyses to study ion transport phenomena.
  • Debye scattering simulations to understand the structural disorder.

Main Results:

  • Vanadate layered materials (Li-V3O8) exhibit amorphization upon Mg2+ intercalation and reversible crystallization upon deintercalation.
  • Intercalation-induced turbostratic disorder, including rotations and shifts of V-O layers, is identified as the cause of amorphization.
  • The distorted local structure facilitates Mg2+ intercalation, contributing significantly to the total ion storage capacity.

Conclusions:

  • A novel mechanism involving reversible amorphization-crystallization dynamics driven by ion transport is revealed for Mg2+ storage in vanadate cathodes.
  • This study opens a new paradigm for designing advanced aqueous battery electrodes by leveraging intercalation-induced structural changes.