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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

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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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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

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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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The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
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Intermolecular Forces03:13

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Planting Repulsion Centers for Faster Ionic Diffusion in Superionic Conductors.

Kyungbae Oh1, Kisuk Kang1,2,3

  • 1Department of Materials Science and Engineering, Research Institute for Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.

Angewandte Chemie (International Ed. in English)
|July 7, 2020
PubMed
Summary

Researchers developed a novel strategy for solid-state batteries by introducing immobile repulsion centers into solid electrolytes. This method significantly enhances ionic conductivity, paving the way for improved battery performance.

Keywords:
ab initio calculationsmaterials designmolecular dynamicssolid-state batteriessuperionic conductors

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Physics

Background:

  • Solid-state batteries require solid electrolytes with high ionic conductivity for successful commercialization.
  • Superionic conductors (SICs) are crucial materials, but optimizing their ionic conductivity remains a challenge.

Purpose of the Study:

  • To propose and investigate a new design strategy for enhancing ionic conduction in SICs.
  • To demonstrate the effectiveness of introducing immobile repulsion centers for improved ion transport.

Main Methods:

  • Utilizing ab initio molecular dynamics simulations.
  • Employing a model system, Na11Sn2PS12, for simulation.
  • Introducing cesium (Cs) ions as doping agents to act as repulsion centers.

Main Results:

  • Achieved an approximately tenfold increase in sodium ionic conductivity in the model system.
  • Demonstrated that doping with large Cs ions effectively enhances ionic transport.
  • Observed the formation of high-energy sites that facilitate fast ionic conduction.

Conclusions:

  • Planting immobile repulsion centers is a viable strategy to tailor ionic diffusion in SICs.
  • This approach offers a novel pathway to design advanced solid electrolytes for solid-state batteries.
  • The findings highlight the potential of exploiting unique ion interactions for conductivity enhancement.