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Related Concept Videos

Ion Exchange01:17

Ion Exchange

594
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...
594

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Solid polymer electrolytes reinforced with porous polypropylene separators for all-solid-state supercapacitors.

Weidong Liu1,2, Zhiyun Li1,2, Fang Pan1,2

  • 1College of Automotive Engineering, Jilin University Changchun 130025 China wdliu@jlu.edu.cn lizhiyun@jlu.edu.cn panfang20@mails.jlu.edu.cn qszhang@jlu.edu.cn +86 15843102088.

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|November 29, 2023
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Summary

This study developed a novel solid polymer electrolyte composite membrane by infiltrating ionic liquids into polyolefin separators. This material achieves high ionic conductivity and mechanical strength for advanced all-solid-state supercapacitors.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Solid polymer electrolytes (SPEs) face challenges in balancing ionic conductivity and mechanical robustness.
  • Incorporating ionic liquids (ILs) into high-performance supercapacitors is hindered by poor infiltration in commercial polyolefin separators.

Purpose of the Study:

  • To develop a novel SPE composite membrane with enhanced ionic conductivity and mechanical strength.
  • To overcome the low wettability issue between ILs and polyolefin separators for integrated applications.

Main Methods:

  • A novel SPE was created using polyethylene oxide (PEO), lithium salt, and varying proportions of ILs, uniformly infiltrated into commercial polyolefin separators.
  • The composite membranes were characterized for ionic conductivity, mechanical properties, and interfacial resistance.

Main Results:

  • The 70 wt% IL-filled composite membrane (PLI(70)@PP) demonstrated high ionic conductivity (2.9 × 10-3 S cm-1) and excellent mechanical strength (128 MPa).
  • An all-solid-state supercapacitor utilizing PLI(70)@PP achieved a specific capacitance of 158 F g-1 with stable cycling performance.
  • The developed method is suitable for high-volume roll-to-roll processing.

Conclusions:

  • The developed IL-filled SPE composite membranes offer a promising solution for high-performance all-solid-state supercapacitors.
  • This approach addresses key limitations in integrating ILs with commercial separators, enabling robust energy storage devices.