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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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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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Ion-Exchange Chromatography01:09

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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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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Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Constructing an anion-capturing interface to achieve Li+ cross-phase transport in composite solid electrolytes.

Jian Lan1, Ying Zhong1, Hao Peng1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China.

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|December 11, 2025
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Researchers developed an anion-capturing interface using FeF3 on solid electrolytes to improve ionic conductivity in solid-state lithium metal batteries. This interface engineering enhances lithium-ion transport and battery performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Solid-state lithium metal batteries offer enhanced safety but are limited by low ionic conductivity in solid electrolytes.
  • Charged interfaces and concentration gradients hinder lithium-ion (Li+) transport and battery performance.

Purpose of the Study:

  • To engineer an anion-capturing interface on solid electrolytes to enhance Li+ conductivity and battery performance.
  • To address interfacial challenges in solid-state lithium metal batteries.

Main Methods:

  • A sol-gel method was used to create an FeF3-based anion-capturing interface on a Li6.5La3Zr1.5Ta0.5O12 (LLTO) solid electrolyte surface.
  • Composite solid electrolytes were fabricated by incorporating the modified LLTO with a polymer.

Main Results:

  • The FeF3 interface promoted Li-salt dissociation and facilitated Li+ migration, reducing interfacial resistance.
  • The composite solid electrolyte achieved an ionic conductivity of 1.1×10-4 S/cm² and a Li+ transference number of 0.75.
  • Li symmetrical batteries demonstrated stable Li plating/stripping for over 1300 hours with low polarization.
  • Solid-state batteries with LiFePO4 cathodes exhibited a specific capacity of 152.8 mAh/g at 1.0 C with 96% retention after 600 cycles.

Conclusions:

  • Interface engineering with anion-capturing FeF3 is a promising strategy to overcome interfacial limitations in solid electrolytes.
  • The developed composite solid electrolyte shows potential for high-performance solid-state lithium metal batteries.