Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-12391-3
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Funding
- Engineering and Physical Sciences Research Council (EPSRC) [EP/L017695/1]
- (MASSIVE) [201606280030, 201506630005]
- China Scholarship Council (CSC)
- EPSRC [EP/L017695/1] Funding Source: UKRI
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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 gamma-ray radiations. Herein, a facile process of pressing-and-folding is proposed to produce beta-poly(vinylidene fluoride) (beta-phase content: similar to 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.
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