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Updated: Jun 27, 2026
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
Published on: April 8, 2018
Surface energy-driven perpendicular gradient structure in flexible composite dielectrics for high-temperature
Minhao Yang1,2,3, Huarui Yan4, Shiang Zhao4
1Institute of Energy Power Innovation, North China Electric Power University, Beijing, China. minhao.yang@ncepu.edu.cn.
Nature Communications
|June 25, 2026
Summary
Flexible polymer dielectrics with a novel Si-O-Ti crosslinking network achieve high energy density and efficiency at 200°C. This breakthrough enhances performance for advanced electrical systems and power electronics.
Area of Science:
- Materials Science
- Polymer Science
- Electrical Engineering
Background:
- Flexible dielectrics are crucial for advanced electrical systems but conventional polymers degrade at high temperatures.
- Conduction losses in polymers limit discharged energy density and charge-discharge efficiency at elevated temperatures.
Purpose of the Study:
- To develop a flexible polymer composite dielectric with enhanced high-temperature performance.
- To improve discharged energy density and charge-discharge efficiency for power electronics.
Main Methods:
- Fabrication of a perpendicular gradient structured polymer composite dielectric.
- Incorporation of an inorganic hybrid crosslinking network of silicon-oxygen-titanium (Si-O-Ti).
- Characterization of surface and bulk properties, thermal stability, mechanical modulus, and insulation strength.
Main Results:
- SiO2 accumulation on the surface blocks charge injection, while bulk TiO2 enhances the dielectric constant.
- The Si-O-Ti network improves thermal stability, mechanical modulus, and insulation strength by reducing free volume.
- The composite achieved a discharged energy density of 6.04 J/cm³ with over 90% efficiency at 200°C, a 364.62% improvement over the pristine polymer.
Conclusions:
- The perpendicular gradient structure and Si-O-Ti hybrid crosslinking effectively enhance high-temperature dielectric properties.
- This strategy offers a promising solution for high-temperature capacitive energy storage applications.
- The developed composite demonstrates significant potential for advanced electrical systems and modern power electronics.
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