Large-Scale Nanofiber Manufacturing| Enhancedenergystorage performance ofnano-submicron structural dielectric filmsbysuppressedferroelectric phase aggregation

Prof. Bi Ke (BUPT) & Prof. Dang Zhimin (Tsinghua): Enhanced Energy Storage Performance of Nano-submicron Structured Dielectric Films by Suppressing Ferroelectric Phase Aggregation

Challenge: Polymer dielectric materials are widely used in capacitors due to their lightweight, easy processing, high breakdown strength, and self-healing properties. However, simultaneously improving discharge energy density while maintaining high charge/discharge efficiency remains challenging for energy storage dielectric films in electrostatic capacitors.

Approach: Prof. Bi Ke from Beijing University of Posts and Telecommunications and Prof. Dang Zhimin from Tsinghua University designed nano-submicron structured films containing ferroelectric material P(VDF-HFP) and linear dielectric material PMMA through coaxial electrospinning technology.

Innovation 1: The nano-submicron structure enables the film to maximize ferroelectric material content and achieve improved dielectric properties without sacrificing breakdown strength and charge/discharge efficiency.

Innovation 2: The 40%-420 nm PMMA-P(VDF-HFP)@PMMA sample achieved a discharge energy density of 13.72 J/cm³ at 740 kV/mm electric field with 80% charge/discharge efficiency.