Authors
Zhichao Hu, Hua Wang, Hongcheng Yang, Enzhu Li
Published in
Small (Weinheim an der Bergstrasse, Germany). Pages e74327. Jun 23, 2026. Epub Jun 23, 2026.
Abstract
Polymer dielectrics are core components of advanced energy storage materials, and studies have confirmed that incorporating inorganic fillers is an effective strategy to enhance their energy storage performance. However, the application of polymer/inorganic filler composite dielectrics in high-temperature energy storage is limited by the leakage current and dielectric breakdown strength. In this work, we propose a synergistic mechanism based on deep trap construction and carrier transport regulation by introducing hydrothermally synthesized ZrO2 quantum dots (QDs, 4.68 nm in diameter) into a polyetherimide (PEI) matrix to establish deep traps. The electronegativity difference between Zr and O induces a strong positive surface electrostatic potential at the QDs, acting as carrier attraction centers. Upon capturing electrons, the QDs serve as Coulomb scattering centers, significantly suppressing carrier transport at elevated temperatures. The composite achieves outstanding high-temperature energy storage performance: discharge energy density Ud = 6.84 J cm-3, discharge efficiency η > 90%, at 150°C; Ud = 6.68 J cm-3, η > 85%, at 200°C, outperforming most existing polymer/inorganic filler composites. This strategy of synergizing deep trap construction with carrier transport regulation provides a cost-effective and highly efficient approach for the design of high-temperature energy storage dielectrics.
PMID:
42335347
Bibliographic data and abstract were imported from PubMed on 24 Jun 2026.
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