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

Kun Xing, Yanan Hao, Xin-Jie Wang, Lei Huang, Yi Gao, Tong Liang, Yan Meng, Ke Bi (), Shao-Long Zhong () and Zhi-Min Dang ()
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Kun Xing: Beijing University of Posts and Telecommunications
Yanan Hao: Beijing University of Posts and Telecommunications
Xin-Jie Wang: Tsinghua University
Lei Huang: Tsinghua University
Yi Gao: Beijing University of Posts and Telecommunications
Tong Liang: Beijing University of Posts and Telecommunications
Yan Meng: Beijing University of Posts and Telecommunications
Ke Bi: Beijing University of Posts and Telecommunications
Shao-Long Zhong: Tsinghua University
Zhi-Min Dang: Tsinghua University

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract 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.

Date: 2025
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DOI: 10.1038/s41467-025-57249-z

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