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Summary: Dielectric capacitors are becoming increasingly important in electrical power. The research and development of dielectric composites are significant for the development of electrical energy storage and conversion devices. Organic-inorganic layered composites, with advantages in electrical, mechanical, and thermal properties, have complex preparation processes and provide novel compositions and architectures for high-end layered dielectric materials in electrostatic energy storage applications.
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Summary: Achieving a synergistic improvement of permittivity (epsilon(r)) and breakdown strength (E-b) in polymer dielectrics is a challenging task. This study demonstrates that the pi-conjugated comonomer (MHT) can enhance both epsilon(r) and E-b in linear poly(methyl methacrylate) (PMMA) copolymers. Various PMMA-based films were prepared to investigate the effects of different structures and modification methods on the dielectric and energy storage properties. The results show that the random copolymer P(MMA-co-MHT) achieves a maximum epsilon(r) of 5.8 at 1 kHz and a discharge energy density of 15.00 J cm(-3) at 872 MV m(-1), which is 165% higher than pure PMMA.
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Article
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Materials Science, Multidisciplinary
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Summary: This study reported the control of energy level of charge traps in polymer film capacitors by tailoring molecular structures, leading to significant inhibition of charge loss at high temperatures. The optimized crosslinking structure exhibited ultrahigh discharged energy density and high charge/discharge efficiencies, along with excellent cyclability and self-healing features.
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(2023)
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Summary: In this work, we prepared high performance all-organic sandwich structured dielectrics at low temperature by chemically imidizing PI and compounding it with PVDF. The formation of the sandwich structure promoted electric field redistribution, while the outer PI layer effectively suppressed charge injection. This research expands the application of PI in flexible dielectrics and provides important inspiration for the development of polymer dielectric films with high capacitive performance over a wide temperature range.
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Summary: The miniaturization of electronic devices and optimization of power systems have placed strict size requirements on passive components like capacitors, driving the need to reduce the thickness of dielectric polymer films. This reduction in thickness leads to higher capacitance density, reduced raw material consumption, and lighter weight modules and systems. However, these changes also present challenges to dielectric properties, surface conditions, and fabrication methods of the films.
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Haoran Xie et al.
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Summary: To improve the energy storage density of capacitors, the ferroelectric phase poly(vinylidene fluoride) (PVDF) is introduced as a modifier. Blending PVDF-doped PMMA composites enhances the polarization strength but sacrifices the breakdown strength due to the presence of defects. To address this issue, a double-layer structure is designed with controlled interfacial bonding achieved through hot pressing. This work successfully achieves high discharge energy density and maintains energy efficiency in PMMA and PVDF composite films.
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Guanghu He et al.
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CHEMICAL ENGINEERING JOURNAL
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Hang Luo et al.
Summary: This article summarizes the latest research on all-organic polymer dielectrics, including molecular structure design, polymer blends, and layered structured polymers. The challenges in the field and suggestions for future research on high-energy-density polymer dielectrics are also presented.
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Xinshuai Li et al.
Summary: By designing all-organic dielectric films with gradient transition layers, this study achieved polymeric dielectrics with high breakdown strength, high-energy density, and high efficiency, providing new insights for the development of power electronic devices.
MATERIALS TODAY ENERGY
(2022)
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Qi-Kun Feng et al.
Summary: With the development of advanced electronic devices and electric power systems, polymer-based dielectric film capacitors have become particularly important, with all-organic polymers being proven to be more effective choices in the process of scalable, continuous, and large-scale industrial production. Recent progress in the field has focused on strategies to enhance the dielectric properties and energy storage performances of all-organic polymers, with thorough studies on key parameters such as dielectric constant, dielectric loss, breakdown strength, energy density, and charge-discharge efficiency.
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Materials Science, Multidisciplinary
Xin Zhang et al.
Summary: By blending P(VDF-TrFE) with PMMA using a simple two-step process, the ferroelectric response of the polymer can be tailored, leading to improved mechanical and electrical properties. The incorporation of PMMA chains results in a transition from ferroelectric to antiferroelectric-like behavior, overcoming the coherent ferroelectric domain interactions found in common P(VDF-TrFE) films. This work provides a simple and effective strategy for enhancing the ferroelectric response of polymeric materials with great potential for flexible electrical energy storage applications.
SCIENCE CHINA-MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Shengbiao Sun et al.
Summary: Dielectric polymer capacitors are widely used in advanced electronics due to their high power density, but achieving high energy density and discharge efficiency remains a challenge. A novel all-polymer trilayer structure is proposed to address this issue by combining different polymers with specific properties to optimize the electric field distribution, resulting in significantly improved breakdown strength, energy density, efficiency, and cycling stability.
ACS APPLIED MATERIALS & INTERFACES
(2021)
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Chemistry, Multidisciplinary
Liang Sun et al.
Summary: The unique design of an asymmetric all-polymer trilayer composite has been reported to achieve high energy density and high discharge efficiency. By utilizing a nonlinear dielectric layer for high energy density and a linear dielectric layer for high discharge efficiency, along with a transition layer to homogenize the electric field distribution, a significant improvement in breakdown strength and energy density has been demonstrated, resulting in a high efficiency of 89.9% and a high energy density of 12.15 J cm(-3).
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(2021)
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Haoran Xu et al.
Summary: By incorporating pi-pi stacked biphenyl side groups into dipolar polymers, the dielectric constant and energy density of polymer dielectrics can be enhanced, leading to improved performance. Experimental results show that sulfonyl-containing poly(norbornene) PBTMD-SO2 with biphenyl side groups exhibits stronger orientational polarization and higher energy storage efficiency compared to PTMD-SO2 without such groups.
Review
Chemistry, Multidisciplinary
Mengjia Feng et al.
Summary: Using a multilayer structure to improve the energy storage density of dielectric materials has attracted attention in research due to its potential in enhancing the performance of electrostatic capacitors. Studies have shown that this method displays excellent effects and huge potential for future applications.
Review
Chemistry, Multidisciplinary
Andrew Burke
Summary: This paper delves into the design of high energy density dielectric capacitors for energy storage in vehicle, industrial, and electric utility applications, with focus on the dielectric constant and breakdown strength characteristics. Through a review of literature, it was found that very high dielectric constants can be achieved by embedding nanoscale metallic or carbon particles in a host polymer. Calculations show that dielectric materials with an effective dielectric constant of 500-1000 are crucial for developing dielectric capacitor cells with battery-like energy density.
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Summary: Research on advanced energy storage materials has focused on PVDF-based nanocomposites loaded with one-dimensional inorganic nanofillers for improved performance. Ba0.6Sr0.4TiO3 nanofibers with varying diameters were fabricated and optimizing both diameter and content was found to be crucial in achieving a balance between dielectric permittivity and electrical breakdown resistance. However, thicker fillers led to decreased discharged energy density and energy storage efficiency.
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Ru Guo et al.
Summary: Research demonstrates that significant improvements in electric displacement and breakdown strength can be achieved by tuning the crystallization behavior of PVDF polymer films, with phase transition and crystal orientation being key factors. PVDF films stretched to 500% exhibit the highest discharge energy density among dielectric polymers during solid-state drawing.
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ENERGY & ENVIRONMENTAL SCIENCE
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Chao Wang et al.
Summary: The research focuses on creating all-organic sandwich structured dielectric polymer films with enhanced energy storage performance. The use of PVTC and PEI layers in the structure allows for improved dielectric displacement and increased operating temperature, optimizing the performance of the capacitors.
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Summary: Polymers are the preferred materials for dielectrics in high-energy-density capacitors, particularly for applications requiring efficient operation at high temperatures. This review critically analyzes the latest developments in high-temperature dielectric polymers, emphasizing the structural dependence of their properties and performance metrics. The advantages and limitations of current approaches, as well as challenges and future research opportunities, are highlighted.
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