Ultrahigh β-phase content poly(vinylidene fluoride) with relaxor-like ferroelectricity for high energy density capacitors

Nan Meng, Xintong Ren, Giovanni Santagiuliana, Leonardo Ventura, Han Zhang, Jiyue Wu, Haixue Yan, Michael J Reece and Emiliano Bilotti ()
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Nan Meng: Queen Mary University of London
Xintong Ren: Queen Mary University of London
Giovanni Santagiuliana: Queen Mary University of London
Leonardo Ventura: Queen Mary University of London
Han Zhang: Queen Mary University of London
Jiyue Wu: Queen Mary University of London
Haixue Yan: Queen Mary University of London
Michael J Reece: Queen Mary University of London
Emiliano Bilotti: Queen Mary University of London

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Poly(vinylidene fluoride)-based dielectric materials are prospective candidates for high power density electric storage applications because of their ferroelectric nature, high dielectric breakdown strength and superior processability. However, obtaining a polar phase with relaxor-like behavior in poly(vinylidene fluoride), as required for high energy storage density, is a major challenge. To date, this has been achieved using complex and expensive synthesis of copolymers and terpolymers or via irradiation with high-energy electron-beam or γ-ray radiations. Herein, a facile process of pressing-and-folding is proposed to produce β-poly(vinylidene fluoride) (β-phase content: ~98%) with relaxor-like behavior observed in poly(vinylidene fluoride) with high molecular weight > 534 kg mol−1, without the need of any hazardous gases, solvents, electrical or chemical treatments. An ultra-high energy density (35 J cm−3) with a high efficiency (74%) is achieved in a pressed-and-folded poly(vinylidene fluoride) (670-700 kg mol−1), which is higher than that of other reported polymer-based dielectric capacitors to the best of our knowledge.

Date: 2019
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DOI: 10.1038/s41467-019-12391-3

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