Enhanced energy storage performance of nano-submicron structural dielectric films by suppressed ferroelectric phase aggregation

作者：Kun Xing, Yanan Hao, Xinjie Wang, Lei Huang, Yuan Gao, Liang Tong, Yan Meng, Ke Bi, Shao‐Long Zhong, Zhi‐Min Dang · 发表于：Nature Communications · 年份：2025 · DOI：10.1038/s41467-025-57249-z · 被引用次数：42 · 研究领域：Dielectric materials and actuators、Ferroelectric and Piezoelectric Materials、Advanced Sensor and Energy Harvesting Materials

Maintaining high charge/discharge efficiency while enhancing discharged energy density is crucial for energy storage dielectric films applied in electrostatic capacitors. Here, a nano-submicron structural film comprising ferroelectric material P(VDF-HFP) and linear dielectric material PMMA has been flexibly designed via the electrospinning process. Nano-submicron structure enables the film to maximize the ferroelectric material component and obtain improved dielectric performance without sacrificing breakdown strength and charge/discharge efficiency. As a result, the 40%-420 nm PMMA-P(VDF-HFP)@PMMA sample achieved an discharged energy density of 13.72 J/cm³ at a field of 740 kV/mm, with an impressive charge/discharge efficiency of 80%. This work presents a composite dielectric film that excels in breakdown strength, discharged energy density, and charge/discharge efficiency, offering a strategy for designing reliable, industrial-grade energy storage dielectrics. The authors prepare an all-organic dielectric film with a nano-submicron surface layer via electrospinning technology, achieving a simultaneous improvement in the discharged energy density and charge/discharge efficiency.