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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Structure-Property Relationship of Polymerized Ionic Liquids for Solid-State Electrolyte Membranes.

Robert Löwe1,2, Thomas Hanemann1,2, Tatiana Zinkevich1

  • 1Institute for Applied Materials, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany.

Polymers
|April 3, 2021
PubMed
Summary

New ammonium-based ionic liquids were developed for lithium-ion batteries. Longer side chains improved conductivity, but adding salt decreased it, though lithium-ion mobility increased with more salt.

Keywords:
ionic conductivityionic liquidsionogellithium-ion batterypolymerizable ionic liquidssolid state electrolytesolid-state-batterystructure–property relationship

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Polymerized ionic liquids (PILs) are promising electrolytes for lithium-ion batteries.
  • Understanding the structure-property relationships in PILs is crucial for optimizing battery performance.

Purpose of the Study:

  • To synthesize and characterize novel ammonium-based PILs.
  • To investigate the impact of monomer structural modifications on PIL properties.
  • To determine the optimal lithium salt concentration for enhanced ionic conductivity.

Main Methods:

  • Synthesis of eight new ammonium-based polymerized ionic liquids.
  • Preparation of thin membrane films for evaluation.
  • Ionic conductivity measurements.
  • Differential scanning calorimetry for glass transition temperature determination.
  • Pulsed field gradient nuclear magnetic resonance (PFG-NMR) for lithium-ion mobility studies.

Main Results:

  • Increased side chain length in ammonium-based PILs correlated with lower glass transition temperatures and higher ionic conductivity.
  • Addition of lithium conducting salt to PIL membranes resulted in decreased glass transition temperatures and ionic conductivity.
  • PFG-NMR indicated higher lithium-ion mobility in samples with increased conducting salt content.

Conclusions:

  • Monomer structure significantly influences the properties of ammonium-based PILs.
  • A balance between monomer structure and lithium salt concentration is key for optimizing PIL electrolytes.
  • Despite conductivity reduction, higher salt content can enhance lithium-ion mobility in PIL membranes.