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Ion Exchange01:17

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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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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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Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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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.
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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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...
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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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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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Deep Eutectic Solvent-Dominant Crosslinked Polymer Electrolytes Enabling Efficient Chloride-Ion Transport via

Haiyang Xu1, Kangjie Xu1, Yuling Xu1

  • 1State Key Laboratory of Materials-Oriented Chemical Engineering, Jiangsu Collaborative Innovation Center for Advanced Inorganic Functional Composites, College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211816, China.

Small (Weinheim an Der Bergstrasse, Germany)
|September 18, 2025
PubMed
Summary

Researchers developed a novel solid polymer electrolyte (SPE) for chloride ion batteries (CIBs) using a deep eutectic solvent (DES) and polymer network. This breakthrough enhances ionic conductivity and stability, paving the way for safer, high-performance batteries.

Keywords:
chloride ion batteriescrosslinked networkdeep eutectic solventionic conductivitypolymer electrolytesrate capability

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Solid polymer electrolytes (SPEs) are crucial for advancing chloride ion batteries (CIBs) by addressing issues like electrode dissolution and volume changes.
  • However, achieving high ionic conductivity and robust electrochemical stability in SPEs remains a significant challenge for practical CIB applications.

Purpose of the Study:

  • To develop a synergistic strategy for creating advanced SPEs by combining a tailored deep eutectic solvent (DES) with a crosslinked polymer network.
  • To overcome the limitations of existing SPEs in terms of ionic conductivity and electrochemical stability for CIBs.

Main Methods:

  • A novel DES was synthesized by tailoring the cation structure of chloride salts, specifically using tributylmethylammonium chloride with succinonitrile for enhanced Cl- dissociation.
  • This DES was incorporated into a crosslinked ethoxylated trimethylolpropane triacrylate (ETPTA) polymer network to form flexible, self-standing SPE films.
  • The electrochemical performance of the optimized ETPTA3-DES7 SPE was evaluated in symmetric and full CIB cells.

Main Results:

  • The optimized ETPTA3-DES7 SPE demonstrated a record-high room-temperature ionic conductivity of 6.54 × 10-4 S cm-1.
  • The SPE exhibited significantly improved electrochemical stability compared to the pristine DES.
  • The developed SPE enabled high reversible capacities, excellent rate capability, and stable cycling in CIBs, even at sub-ambient temperatures (0 °C).

Conclusions:

  • The synergistic combination of a tailored DES and a crosslinked polymer network effectively enhances ionic conductivity and electrochemical stability in SPEs for CIBs.
  • The flexible and stable SPE films show great promise for practical applications, as evidenced by their reliable performance in prototype pouch cells under various conditions.
  • This work presents a viable pathway towards developing safer and more efficient chloride ion battery technologies.