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Ion Exchange

Ion Exchange

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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Preparation of DNA-crosslinked Polyacrylamide Hydrogels

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Published on: August 27, 2014

High-Performance Ionogels from Dynamic Polyrotaxane-Based Networks.

Shanshan Yan¹, Jinjia Liu^2,3, Zhenni He¹

¹Institute of Condensed Matter and Nanoscience (IMCN), Université catholique de Louvain, Place L. Pasteur 1, 1348, Louvain-la-Neuve, Belgium.

Angewandte Chemie (International Ed. in English)

|February 24, 2025

Summary

This summary is machine-generated.

Researchers developed a novel ionogel electrolyte using a crosslinked polyrotaxane network. This design enhances lithium-ion migration and transference number, crucial for advanced battery applications.

Keywords:

competitive coordination dynamically cross-linked polyrotaxanes ionogel electrolyte

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Area of Science:

Materials Science
Electrochemistry
Polymer Chemistry

Background:

Ionogel electrolytes are formed by swelling polymer matrices with ionic liquids and lithium salts.
Increased ion concentration often decreases lithium-ion transference number due to ion trapping.
High lithium-ion migration efficiency and transference number are vital for ionogel applications.

Purpose of the Study:

To design an ionogel electrolyte with enhanced lithium-ion transport.
To improve the lithium-ion transference number (t_Li⁺) in ionogel electrolytes.
To investigate the effect of competitive coordination on ion mobility.

Main Methods:

Synthesized a crosslinked polyrotaxane network.
Incorporated ionic liquid and lithium salt into the network.
Utilized competitive coordination principle to minimize lithium-ion binding energy.
Fabricated and tested ionogel electrolytes in lithium-lithium symmetrical cells and NMC622||Li batteries.

Main Results:

Achieved an ionic conductivity of 2.2×10^-3 S cm^-1 and t_Li⁺ of 0.45 at 20°C.
Demonstrated stable cycling for 2000 hours in lithium-lithium symmetrical cells.
Showcased good rate performance and cycling stability in NMC622||Li batteries (0.03% capacity loss per cycle over 300 cycles).

Conclusions:

The designed crosslinked polyrotaxane ionogel facilitates efficient lithium-ion migration and release.
This approach offers a new strategy for developing high-performance ionogel electrolytes.
The findings provide insights into optimizing ion transport for energy storage applications.