Authors
Xin Li, Le Zhou, Yao Xiao, Erxiang Xu, Taoyuan Yu, Mufeng Zhang, Minzheng Yang, Weibin Ren, Penghao Hu, Yang Shen
Published in
Advanced science (Weinheim, Baden-Wurttemberg, Germany). Pages e12343. Sep 15, 2025. Epub Sep 15, 2025.
Abstract
Polymer dielectrics display high breakdown strength (Eb) and larger power density, rendering them an indispensable component in electronic energy storage applications. Nevertheless, the discharged energy density (Ud) of polymer dielectrics is limited by relatively low dielectric constant (εr) and sharply decreases in Eb at elevated temperatures. The simultaneous improvement in both Eb and εr is highly desired, but the inverted relationship requires urgent resolution. Herein, the study introduces several plasticizers with low content into polyetherimide (PEI) matrix to fabricate composites. The formation of a bicontinuous phase network in polymer matrix is achieved through anti-plasticization. Owing to the discrepancy in polarizability, the network can achieve an electric field redistribution and interface polarization. It is composed of a dielectric phase (bear a lower electric field) and an insulation phase (bear a higher electric field), resulting in a concomitant enhancement on both εr and Eb. A relatively high Ud of 4.88 J cm-3 accompanied by η = 90% and charge-discharge cycle stability up to 105 cycles at 150 °C are achieved in the composite content with 3 wt.% of butylsuccinic anhydride. This work presents a promising strategy for decoupling the inverse relationship and fabricating applicable high-temperature polymer dielectrics through phase structure modulation.
PMID:
40953297
Bibliographic data and abstract were imported from PubMed on 16 Sep 2025.
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