A Double‐Gradient All‐Organic Dielectric Polymer Film Achieving Superior Breakdown Strength and Energy Density

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 21, 2025

Ferroelectric polymers have drawn tremendous attention in film capacitors owing to their high permittivity and ease of processing. Nevertheless, the energy density such materials is severely constrained due inferior breakdown strength. To address this dilemma, a double-gradient multilayered all-organic dielectric composite proposed, fabricated via simple layer-by-layer solution-casting process. The experimental results demonstrate that significantly suppresses leakage current compared pristine films, resulting remarkable enhancement insulation properties. finite element simulation further reveal optimized electric field distribution induced by gradient structure carrier traps at interfaces between adjacent layers play crucial role impeding propagation path. As result, developed reaches an unexpected strength 712 MV m-1 along with 19.68 J cm-3, surpassing bench-mark biaxially oriented polypropylene as well existing ferroelectric-based composites reported recent works. synergy presented work offers novel perspective approach for scalable fabrication films eminent capacitive performance.

Language: Английский

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Enhanced Dielectric Properties of Polyetherimide‐Based Nanocomposite Films With Doped Semiconductor Traps

Polymers for Advanced Technologies, Journal Year: 2025, Volume and Issue: 36(3)

Published: March 1, 2025

ABSTRACT The emerging electronic devices demand dielectric polymer films with high energy storage density over a wide temperature range. However, the mobility of charge carriers leads to unsatisfactory performance even for heat‐resistant polymers such as polyetherimide (PEI). Therefore, enhance dielectrics, it is critical concurrently focus on increasing constant and improving breakdown strength by hindering migration electrons, which highly correlated intrinsic bandgap structures dielectrics. Inspired tunable structure doped semiconductors, this work aimed at strengthening trapping depending construction electron traps formation electron–hole pairs, that is, tailor ZnS 1−x O x via oxygen doping band /PEI interface region, thereby significantly enhancing composite films. At room 450 kV mm −1 , ( U d ) 0.4 vol% 0.7 0.3 reaches 5.7 J cm −3 charge–discharge efficiency η 96.6%, 2.3 times pure PEI (2.5 = 86.2%). Moreover, film exhibits excellent stability temperatures. 150°C 350 remains 3.4 89.1%, higher than (1.5 80.6%). This provides novel perspective design high‐performance interfacial engineering.

Language: Английский

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Remarkable High‐Temperature Energy Storage in Co‐Polymerized Polyetherimide Via Constructing Hybrid Electrostatic Potential Barriers

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 7, 2025

Abstract High‐temperature dielectric polymers are increasingly attracting significant interest for energy storage applications in harsh environments. However, the exponentially increased conduction losses under high temperatures and elevated electric fields often cause serious degradation of capacitive performance dielectrics. Unlike most reported energy‐level tuning strategies, this study introduces a novel approach that constructs localized electrostatic barriers to enhance high‐temperature polyetherimide (PEI) films. By copolymerizing amide groups MPD (1,3‐Phenylenediamine) PAB (4,4′‐Diaminobenzanilide) into PEI backbone, strong separation effect dipoles is established, leading potentials difference. Density Functional Theory (DFT) proves intermolecular local potential fluctuations generate hybrid (4.2 eV) trap carriers suppress their migration within spatial freedom domain. Consequently, largely suppressed leakage current enhanced breakdown strength yielded co‐10PAB/90MPD polymer, creating density 4.3 J cm −3 ( η > 90%) at 200 °C as comparison original PEI‐MPD (2.1 ), which surpasses polymers. This work demonstrates promising paradigm dipolar regulation molecular level

Language: Английский

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The Large‐Scale Manufacturing of Polymer Dielectric Capacitors: Advancements and Challenges

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 16, 2025

Abstract Since the 18th century, capacitors have significantly advanced in theoretical research and industrial applications. With increasing demand for high‐performance capacitors, focus on materials manufacturing techniques has become critical. This review aims to provide a comprehensive survey of polymer emphasizing their processes connection between practical Beginning with fundamental principles dielectric capacitor design, this delves into key aspects such as material preparation, film fabrication, assembly while addressing challenges scale‐up usage. Special attention is given metallization winding processes, these are pivotal ensuring high reliability performance capacitors. Additionally, analyzes growing market enhanced thermal stability operational efficiency, identifying directions address current limitations. By integrating latest advancements high‐temperature dielectrics, valuable insights both academia industry. Finally, forward‐looking perspective provided future development trends obstacles that lie ahead, necessity stronger collaboration industry foster innovation vital field.

Language: Английский

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Structures and Properties of Polyimide Dielectric Materials

Published: March 21, 2025

Language: Английский

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