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This study explores structural/multifunctional electrolytes (SEs) for energy storage. Researchers used small angle neutron scattering to observe the formation of bicontinuous structures in epoxy-ionic liquid systems during curing.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Structural/multifunctional electrolytes (SEs) are crucial for advanced energy storage devices like structural supercapacitors and batteries.
  • These electrolytes must simultaneously conduct ions and provide mechanical support.
  • Bicontinuous structures, comprising two independent phases, are considered optimal for SEs.

Purpose of the Study:

  • To investigate the formation mechanisms of bicontinuous structures in epoxy-ionic liquid systems.
  • To understand the influence of curing time and temperature on structural evolution.
  • To evaluate the impact of multifunctional block copolymers on the curing process.

Main Methods:

  • Small Angle Neutron Scattering (SANS) was employed to monitor structural changes during the curing process.
  • Data analysis involved fitting with two distinct models to capture structural evolution at different length scales.
  • Experiments were conducted at varying temperatures to assess their effect on reaction kinetics and structure.

Main Results:

  • SANS data revealed structural evolution at different length scales throughout the curing process.
  • Polymer clusters (25-75 nm) formed in early stages, with size dependent on temperature.
  • Increasing temperature accelerated the reaction rate but maintained the overall structural evolution trend.
  • Addition of a multifunctional block copolymer significantly altered the curing process at later stages.

Conclusions:

  • The study elucidates the complex structural evolution during the formation of SEs.
  • Temperature plays a critical role in polymer cluster formation and reaction kinetics.
  • Multifunctional block copolymers offer a route to modify and potentially optimize SE formation for energy storage applications.