Authors
Wenshuai Zhao, Wenjie Huang, Jiayang Han, Di Hu, Tao Li, Lin Zhu, Yong Chae Jung, Yongqiang Wen, Jun-Wei Zha
Published in
Small (Weinheim an der Bergstrasse, Germany). Pages e74796. Jul 28, 2026. Epub Jul 28, 2026.
Abstract
Polymer dielectrics exhibit significant advantages in dielectric capacitors due to their high breakdown strength, thermal stability, and excellent processability. However, polyetherimide (PEI) exhibit a significant increase in conduction loss at elevated temperatures due to a strong intramolecular charge transfer effect, severely limiting energy storage performance. This work proposes a design strategy based on molecular structural regulation to suppress conduction loss. Functional diamine units are introduced into the PEI backbone to construct local state traps, while regulating the suppression of charge transport by local hole traps and local large conjugated dihedral angle. The results demonstrate that PEI copolymer films with 4,4'-Oxydianiline (ODA) can achieve optimal regulation between local hole traps and local large conjugated dihedral angle, thereby introducing the deepest local state traps and significantly suppressing charge transport. At 200 °C, PEI-ODA film exhibits an exceptional discharge energy density of 3.82 J/cm3 with an efficiency exceeding 90%, while maintaining high reliability of 50 000 cycles. This research presents a molecular design strategy for high-temperature applications, providing significant insights for the development of high-temperature polymer dielectric for high-power electronic systems.
PMID:
42517255
Bibliographic data and abstract were imported from PubMed on 28 Jul 2026.
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