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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

794
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
794

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Highly Conductive PEO/PAN-Based SN-Containing Electrospun Membranes as Solid Polymer Electrolytes.

Anna Maria Kirchberger1,2, Patrick Walke1,2, Janio Venturini1

  • 1TUM School of Natural Sciences, Technische Universität München, Lichtenbergstr. 4, 85748 Garching bei München, Germany.

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Summary

This study developed electrospun polymer blends for solid polymer electrolytes (SPEs) in all-solid-state batteries (ASSBs). The optimized blend achieved high ionic conductivity and capacity, addressing key challenges for battery performance.

Keywords:
all-solid-state batteriesconductivityelectrospinningsolid polymer electrolytes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Solid polymer electrolytes (SPEs) are crucial for developing safer all-solid-state batteries (ASSBs).
  • Current SPEs face limitations in thermal stability and ionic conductivity, hindering widespread adoption.
  • Electrospun polymer blends offer a promising route to overcome these challenges.

Purpose of the Study:

  • To investigate the effect of polymer ratios and plasticizer concentration on the properties of electrospun (PAN/PEO)-LiBF4 solid polymer electrolytes.
  • To optimize the composition for enhanced ionic conductivity and electrochemical performance in ASSBs.
  • To elucidate the role of polymer immiscibility in facilitating ion transport.

Main Methods:

  • Fabrication of electrospun polymer blend membranes using varying ratios of polyacrylonitrile (PAN) and polyethylene oxide (PEO).
  • Incorporation of lithium bis(trifluoromethane sulfonyl)imide (LiTFSI) as a conductive salt and succinonitrile (SN) as a plasticizer.
  • Characterization of ionic conductivity, morphology, and electrochemical performance in symmetrical cells.

Main Results:

  • The 50:50 PAN/PEO blend demonstrated the highest ionic conductivity of 1 × 10⁻² S/cm at 55 °C.
  • Increased succinonitrile (SN) content enhanced the capacity in symmetrical cells, reaching ~140 mAs/cm² for an 18:9:1 polymer:SN:LiBF4 composition.
  • The immiscibility of PAN and PEO created distinct interfacial regions, promoting efficient lithium-ion pathways.

Conclusions:

  • Electrospun polymer blends, particularly the PAN/PEO system, show significant potential as high-performance SPEs for ASSBs.
  • The strategic use of immiscible polymers and plasticizers can effectively enhance ionic conductivity and battery capacity.
  • This approach offers a viable strategy for developing advanced materials for next-generation energy storage devices.