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Related Concept Videos

Ion Exchange01:17

Ion Exchange

639
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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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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UV-derived double crosslinked PEO-based solid polymer electrolyte for room temperature.

Ying Ji1, Yu-Hang Zhang1, Fa-Nian Shi1

  • 1School of Environmental and Chemical Engineering, Shenyang University of Technology, Shenyang 110870, China.

Journal of Colloid and Interface Science
|September 29, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a novel cross-linked solid polymer electrolyte (SPE) using polyethylene oxide (PEO) with enhanced ionic conductivity and mechanical strength for solid-state batteries.

Keywords:
CrosslinkingHigh ionic conductivityRoom temperatureSolid polymer electrolytesUV curing

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Polyethylene oxide (PEO)-based solid electrolytes suffer from low ionic conductivity and poor dimensional stability, hindering their application.
  • Developing solid polymer electrolytes (SPEs) with both high electrochemical performance and mechanical strength is a significant challenge.

Purpose of the Study:

  • To design and prepare a novel cross-linked PEO-based solid polymer electrolyte (SPE) with improved ionic conductivity and mechanical properties.
  • To overcome the limitations of conventional PEO-based SPEs for solid-state battery applications.

Main Methods:

  • A solvent-free cross-linking method using green ultraviolet irradiation was employed.
  • The material incorporated active -CH2CH2O- soft chains doped with rigid segments to form a cross-linked structure.
  • Characterization included ionic conductivity measurements, transference number determination, activation energy calculation, tensile testing, and galvanostatic cycling of Li||Li symmetrical cells.

Main Results:

  • The resulting PTP-SPE exhibited a high ionic conductivity of 0.2 mS·cm⁻¹ and an ionic transference number of 0.51 at room temperature.
  • The material demonstrated excellent mechanical properties with a tensile elongation of 40% and a low activation energy of 1.92 kJ·mol⁻¹.
  • The PTP-SPE effectively inhibited lithium dendrite formation in Li||Li symmetrical cells over 500 hours of cycling.

Conclusions:

  • The designed cross-linked PEO-based SPE offers a promising strategy for achieving high performance in solid-state electrolytes.
  • This approach reconciles the trade-off between electrochemical performance and mechanical strength in PEO-based SPEs.
  • The developed material shows potential for enabling safer and more efficient solid-state batteries.