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Updated: Aug 5, 2026
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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
Molecular Design of Polymer Dielectrics With Local State Traps for High-Temperature Energy Storage
Wenshuai Zhao1, Wenjie Huang1, Jiayang Han2
1School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, People's Republic of China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 28, 2026
Summary
Researchers developed a molecular design for polyetherimide (PEI) to reduce conduction loss in high-temperature dielectric capacitors. This strategy significantly enhances energy storage performance and reliability for advanced electronic systems.
Area of Science:
- Materials Science
- Polymer Chemistry
- Electrical Engineering
Background:
- Polymer dielectrics offer advantages like high breakdown strength and thermal stability for dielectric capacitors.
- Polyetherimide (PEI) suffers from increased conduction loss at high temperatures due to intramolecular charge transfer, limiting energy storage.
- Developing high-temperature polymer dielectrics is crucial for high-power electronic systems.
Purpose of the Study:
- To suppress conduction loss in polyetherimide (PEI) at elevated temperatures.
- To enhance the energy storage performance and reliability of PEI-based dielectrics for high-temperature applications.
- To present a molecular design strategy for advanced polymer dielectrics.
Main Methods:
- Introduced functional diamine units into the PEI backbone to create local state traps.
- Regulated charge transport using local hole traps and large conjugated dihedral angles.
- Synthesized and characterized PEI copolymer films with 4,4'-Oxydianiline (ODA).
Main Results:
- PEI-ODA films demonstrated optimal regulation of local hole traps and conjugated dihedral angles, creating deep state traps.
- Significantly suppressed charge transport was observed in the PEI-ODA films.
- At 200 °C, PEI-ODA achieved a discharge energy density of 3.82 J/cm³, over 90% efficiency, and 50,000 cycle reliability.
Conclusions:
- The molecular structural regulation strategy effectively suppresses conduction loss in PEI at high temperatures.
- PEI-ODA copolymers show great potential as high-temperature polymer dielectrics for energy storage.
- This research provides valuable insights for designing high-performance polymer dielectrics for demanding applications.
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