Surface energy-driven perpendicular gradient structure in flexible composite dielectrics for high-temperature capacitive energy storage.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 42350460.
- Also identified by DOI 10.1038/s41467-026-74897-x.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Flexible dielectrics are urgently needed in advanced electrical systems and modern power electronics. Nevertheless, conventional polymer dielectrics suffer from low discharged energy density and charge-discharge efficiency at elevated temperatures due to severe conduction loss. Here, we report a perpendicular gradient structured polymer composite dielectric with an inorganic hybrid crosslinking network of Si-O-Ti. Driven by surface energy difference, SiO<sub>2</sub> accumulates on the film surface to block the charge injection, while bulk TiO<sub>2</sub> boosts the dielectric constant. The hybrid crosslinking network of Si-O-Ti also enhances the thermal stability, mechanical modulus and insulation strength by reducing free volume. Ultimately, the obtained composite delivers a discharged energy density of 6.04 J/cm<sup>3</sup> above 90% efficiency at 200 °C, exhibiting a 364.62% enhancement over the pristine polymer. This strategy effectively modulates surface and bulk properties, accordingly contributing to improving high-temperature capacitive energy storage performance.