Liquid metal interface mechanochemistry disentangles energy density and biaxial stretchability tradeoff in composite capacitor film

Zilong Xie, Jianan Zhu, Zhengli Dou, Yongzheng Zhang, Ke Wang, Kai Wu () and Qiang Fu ()
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Zilong Xie: Sichuan University
Jianan Zhu: Sichuan University
Zhengli Dou: Sichuan University
Yongzheng Zhang: Sichuan University
Ke Wang: Sichuan University
Kai Wu: Sichuan University
Qiang Fu: Sichuan University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Dielectric polymer composites for film capacitors have advanced significantly in recent decades, yet their practical implementation in industrial-scale, thin-film processing faces challenges, particularly due to limited biaxial stretchability. Here, we introduce a mechanochemical solution that applies liquid metal onto rigid dielectric fillers (e.g. boron nitride), dramatically transforming polymer-filler interface characteristics. This approach significantly reduces modulus mismatch and stress concentration at the interface region, enabling polypropylene composites to achieve biaxial stretching ratio up to 450 × 450%. Furthermore, liquid metal integration enhances boron nitride’s dielectric polarization while maintaining inherent insulation, producing high-dielectric-constant, low-loss films. These films, only microns thick yet quasi square meters in area, achieve a 55% increase in energy density over commercial biaxially-oriented polypropylene (from 2.9 to 4.5 J cm−3 at 550 MV/m), keeping 90% discharge efficiency. Coupled with improved thermal conductivity, durability, and device capacitance, this distinctive interface engineering approach makes these composites promising for high-performance film capacitors.

Date: 2024
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DOI: 10.1038/s41467-024-52234-4

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