ArticleSmall (Weinheim an der Bergstrasse, Germany)2026
Molecular Design of Polymer Dielectrics With Local State Traps for High-Temperature Energy Storage.
Article in Small (Weinheim an der Bergstrasse, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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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/cm
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