Enhancing energetic disorder in all-organic composite dielectrics for high-temperature capacitive energy storage.

ABSTRACT: The urgent demand for capacitive energy storage at elevated temperatures is limited by significant leakage currents in existing polymer dielectrics, which lead to excessive heat generation and increase the risk of thermal runaway. Here we demonstrate a strategy to mitigate conduction loss by modulating energetic disorder within the polymer matrix. Incorporation of high-polarity organic molecules into polyetherimide enhances dipole-dipole interactions, increasing energetic disorder and thereby decreasing charge carrier mobility. Experimental measurements and computational simulations reveal that disorder-induced energy fluctuations broaden the energy separation between transport states, effectively suppressing charge transport. The resulting composite delivers an energy density of 6.45 J cm

SUBMITTER: Zeng T 

PROVIDER: S-EPMC12216148 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature