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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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Updated: Jun 26, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Poly(ethylene oxide)- and Polyzwitterion-Based Thermoplastic Elastomers for Solid Electrolytes.

Ding-Li Xia¹, Shi-Peng Ding¹, Ze Ye¹

¹National Key Laboratory of Biobased Transportation Fuel Technology, International Research Center for X Polymers, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, China.

Materials (Basel, Switzerland)

|May 11, 2024

Summary

This summary is machine-generated.

New polyzwitterionic poly(4-vinylpyridine) propane-1-sulfonate)-block-poly(ethylene oxide)-block-poly(4-vinylpyridine) propane-1-sulfonate) (PVPS-b-PEO-b-PVPS) triblock copolymers were synthesized and doped with lithium bis-(trifluoromethane-sulfonyl) imide (LiTFSI) to create solid polyelectrolytes for lithium-ion batteries.

Keywords:

block copolymer electrical performance mechanical strength polyzwitterion solid electrolytes

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Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

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Area of Science:

Polymer Science
Materials Science
Electrochemistry

Background:

Solid polymer electrolytes (SPEs) are crucial for developing safer and more efficient lithium-ion batteries.
Triblock copolymers offer tunable properties for advanced material applications.
Poly(ethylene oxide) (PEO) based electrolytes face challenges in ionic conductivity and mechanical strength.

Purpose of the Study:

To synthesize and characterize novel ABA triblock copolymers (tri-BCPs) with a PEO middle block and PVPS outer blocks.
To investigate the effect of PVPS content and LiTFSI doping on the microphase separation and thermal properties of the tri-BCP/LiTFSI hybrids.
To evaluate the potential of these PVPS-b-PEO-b-PVPS/LiTFSI hybrids as solid electrolytes for lithium-ion batteries.

Main Methods:

Synthesis of PVPS-b-PEO-b-PVPS triblock copolymers.
Doping of tri-BCPs with lithium bis-(trifluoromethane-sulfonyl) imide (LiTFSI).
Characterization using small-angle X-ray scattering (SAXS) to study microphase separation.
Thermal analysis (melting temperature, glass transition temperature) and mechanical property assessment.
Ionic conductivity measurements.

Main Results:

All tri-BCPs formed asymmetric lamellar structures with PVPS volume fractions between 12.9% and 26.1%.
Microphase separation strength increased with PVPS fraction but decreased with doping ratio, impacting thermal properties.
PVPS-b-PEO-b-PVPS/LiTFSI hybrids exhibited higher modulus and ionic conductivity compared to PEO/LiTFSI hybrids.
Enhanced ionic conductivity was attributed to PVPS blocks aiding Li+ ion dissociation.

Conclusions:

PVPS-b-PEO-b-PVPS triblock copolymers doped with LiTFSI show promising properties as solid electrolytes.
The polyzwitterionic outer blocks contribute to improved mechanical strength and ionic conductivity.
These materials hold potential for use in next-generation lithium-ion batteries.