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Performance Optimization of Electrospun Lithium-Ion Conducting PAN/PEO Solid Polymer Electrolyte.

Elisabeth B Springl1,2, Diganta Sarkar3, Marvin Mühlau1,2

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Summary

This study presents a scalable, one-step electrospun solid polymer electrolyte for safer, high-energy-density lithium-ion batteries. The flexible membrane offers excellent thermal stability and tunable ionic conductivity for advanced energy storage applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Rechargeable lithium-ion batteries are crucial for renewable energy storage.
  • Solid electrolytes in all-solid-state batteries enhance safety and energy density compared to liquid electrolytes.

Purpose of the Study:

  • To develop a scalable, one-step method for producing solid polymer electrolyte membranes.
  • To investigate the properties and performance of electrospun polymer blend membranes for lithium-ion batteries.

Main Methods:

  • Electrospinning of a polyacrylonitrile (PAN) and poly(ethylene oxide) (PEO) blend with LiTFSI salt.
  • Characterization of membrane morphology, thermal stability, and ionic conductivity.
  • Electrochemical testing including galvanostatic cycling and electrochemical window determination.

Main Results:

  • Flexible, free-standing membranes with fiber retention up to 100 °C were produced.
  • Ionic conductivity reached 0.1 mS cm-1 at 328 K, tunable via processing conditions.
  • Demonstrated low activation energy for Li-ion transport and an electrochemical window of 0–4.5 V.

Conclusions:

  • The electrospun solid polymer electrolyte exhibits promising performance for high-performance lithium-ion batteries.
  • The scalable manufacturing process and favorable properties suggest potential for practical applications.
  • The material offers enhanced safety and energy density advantages over traditional liquid electrolytes.