Mixed Ionic-Electronic Conductors Based on PEDOT:PolyDADMA and Organic Ionic Plastic Crystals.

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Mixed ionic-electronic conductors like PEDOT:PSS are crucial for energy storage and electronics.
• Existing research primarily focuses on electronic conductivity and mechanical properties, neglecting ionic conductivity.
• There is a need for advanced materials with improved ionic transport for next-generation devices.

Purpose of the Study:

• To develop novel PEDOT-based blends with enhanced ionic and electronic conductivity.
• To investigate the effect of different anions and organic ionic plastic crystals (OIPCs) on material properties.
• To evaluate the potential of these new materials for energy storage applications.

Main Methods:

• Synthesis of PEDOT blends with poly(diallyldimethylammonium) (PolyDADMA) using various anions (Cl, FSI, TFSI, CF3SO3, Tos).
• Incorporation of organic ionic plastic crystals (OIPCs) based on N-ethyl-N-methylpyrrolidinium (C2mpyr+) cation.
• Characterization of electronic and ionic conductivity, and electrochemical performance of the resulting composites.

Main Results:

• PEDOT:PolyDADMA FSI films achieved an electronic conductivity of 0.6 S cm⁻¹ and ionic conductivity of 5 × 10⁻⁶ S cm⁻¹ at 70 °C.
• PEDOT:PolyDADMA X / [C2mpyr][X] composites exhibited significantly higher ionic conductivity (e.g., 2 × 10⁻⁵ S cm⁻¹ at 70 °C for PEDOT:PolyDADMA FSI/[C2mpyr][FSI]).
• The addition of OIPCs synergistically enhanced both ionic and electronic conductivities, leading to improved electrochemical performance.

Conclusions:

• Novel PEDOT:PolyDADMA blends and OIPC composites demonstrate promising properties for energy storage.
• The strategic combination of PEDOT, PolyDADMA, and OIPCs offers a pathway to tailor ionic and electronic transport.
• These materials represent a significant advancement in the development of high-performance energy storage solutions.