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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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Related Experiment Video

Updated: Mar 8, 2026

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Highly Stable Sodium Batteries Enabled by Functional Ionic Polymer Membranes.

Shuya Wei1, Snehashis Choudhury1, Jun Xu2

  • 1School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, 14853, USA.

Advanced Materials (Deerfield Beach, Fla.)
|January 24, 2017
PubMed
Summary
This summary is machine-generated.

A novel ion-rich polymer membrane protects sodium metal anodes, enhancing battery stability and efficiency by preventing dendrite growth and parasitic reactions during cycling.

Keywords:
electrolyteelectropolymerizationionic liquidsodium dendritessodium metal batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Sodium metal anodes are crucial for high-energy-density batteries but suffer from poor stability.
  • Parasitic reactions and dendrite formation during cycling degrade anode performance and pose safety risks.

Purpose of the Study:

  • To develop and evaluate a protective ion-rich polymeric membrane for sodium metal anodes.
  • To enhance the stability, efficiency, and safety of sodium metal batteries.

Main Methods:

  • In situ electropolymerization of functional imidazolium-type ionic liquid monomers to form the polymer membrane.
  • Protection of the sodium metal anode against electrolyte reactions.
  • Inhibition of dendrite formation and growth.
  • Direct visualization of sodium electrodeposition to assess membrane effectiveness.

Main Results:

  • The ion-rich polymeric membrane significantly enhances the stability of sodium metal anodes.
  • High Coulombic efficiency was achieved during cycling, indicating improved reversibility.
  • The membrane effectively suppressed parasitic reactions with the electrolyte.
  • Fundamental mechanisms inhibiting dendrite formation and growth were elucidated.

Conclusions:

  • The developed in situ formed ion-rich polymer membrane is a promising strategy for stabilizing sodium metal anodes.
  • This approach offers a pathway to safer and more efficient sodium-based energy storage systems.
  • The findings contribute to the fundamental understanding of dendrite suppression in metal batteries.