Details

Autor(en) / Beteiligte

• Zhang, Yang
• Li, Li
• Li, Xiaoyu
• Feng, Rui
• Zhao, Tingting
• Pan, Meng
• Dong, Lijie

Titel

High‐Energy‐Density All‐Organic Dielectric Film via a Continuous Preparation Processing

Ist Teil von

• Advanced functional materials, 2023-06, Vol.33 (25), p.n/a

Ort / Verlag

Hoboken: Wiley Subscription Services, Inc

Erscheinungsjahr

2023

Quelle

Wiley Online Library

Beschreibungen/Notizen

• Dielectric polymers with high power density and breakdown strength (Eb) are indispensably used in electrostatic energy‐storing systems and devices. However, the discharged energy density (Ue) of dielectric polymers is severely limited due to the relatively low dielectric constant (K). Although current polymer composites improve K, this approach usually faces challenges in enhancing Ue due to the trade‐off relation between K and Eb and difficulties in scalable production of dielectric films. Here, a fully melt‐extrudable, meter‐scale, and high‐Ue ferroelectric polymer‐based all organic composite film comprising a poly(p‐phenylene terephthalamide)‐based fluxible polymer (denoted as f‐PPTA) is reported. The polymer composite with only 2 wt% of f‐PPTA presents a productivity of 12 m2 h−1 and an ultrahigh Ue of 20.7 J cm−3, which outperforms other extruded dielectric polymers reported in the literatures. Such enhancements of dielectric and capacitive properties have been comprehensively investigated and attributed to the crystallization behavior modulations and conformation changes induced by f‐PPTA. As a demonstration of real applications, the dielectric capacitors established based on the extruded films enable tens of times higher efficacy on powering electronic devices than biaxially oriented polypropylene capacitors, in addition to long‐term cyclic stability. This study opens up new avenue for the design and fabrication of high‐Ue polymer dielectrics that are totally compatible with industrial production. The fully melt‐extrudable and meter‐scale PVDF/f‐PPTA film exhibits a high discharged energy density of 20.7 J cm−3 with a charge–discharge efficiency of 76% at 629 MV m–1, as well as a long‐term cyclic dielectric stability. The large‐sized film capacitor is prepared with the measured capacitance 18.0 times higher than that of benchmark biaxially oriented polypropylene capacitor.