Boosting ionic conductivity of single-ion conductive polyelectrolyte elastomers via high-dielectric plasticizers

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Ionic conduction is crucial for biological systems, energy storage, and ionotronic devices.
• Polyelectrolyte elastomers are promising solid-state single-ion conductors due to ion selectivity, leakage-free nature, and mechanical elasticity.
• Current polyelectrolyte elastomers exhibit low ionic conductivity (~10^-3 mS cm^-1), hindering their practical application.

Purpose of the Study:

• To enhance ionic conductivity in polyelectrolyte elastomers while maintaining leakage-free operation.
• To introduce a materials design strategy for improved ion transport.
• To overcome the limitations of existing solid-state single-ion conductors.

Main Methods:

• Introduction of a solid-state additive with a high dielectric constant and plasticizing effect.
• Utilizing succinonitrile as a demonstrated additive.
• Testing the approach across both polycationic and polyanionic polyelectrolyte systems.

Main Results:

• Achieved over two orders of magnitude increase in ionic conductivity at room temperature.
• Enhanced ion transport by increasing dissociated ion density (n) and ion mobility (μ).
• Maintained or improved mechanical elasticity alongside conductivity gains.

Conclusions:

• The developed materials design approach offers a versatile route to stable and efficient ion transport.
• This strategy significantly boosts conductivity in diverse polyelectrolyte networks.
• Enables the development of next-generation solid-state single-ion conductors for various applications.