Enhanced dielectric properties and thermostability in polyimide composites with core-shell structured polyimide@BaTiO3 nanoparticles

2021 ◽  
pp. 095400832199352
Author(s):  
Wei Deng ◽  
Guanguan Ren ◽  
Wenqi Wang ◽  
Weiwei Cui ◽  
Wenjun Luo
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Energy Density ◽  
Breakdown Strength ◽  
In Situ Polymerization ◽  
Dielectric Materials ◽  
High Energy ◽  
Amic Acid ◽  
High Energy Density ◽  
Core Shell

Polymer composites with high dielectric constant and thermal stability have shown great potential applications in the fields relating to the energy storage. Herein, core-shell structured polyimide@BaTiO3 (PI@BT) nanoparticles were fabricated via in-situ polymerization of poly(amic acid) (PAA) and the following thermal imidization, then utilized as fillers to prepare PI composites. Increased dielectric constant with suppressed dielectric loss, and enhanced energy density as well as heat resistance were simultaneously realized due to the presence of PI shell between BT nanoparticles and PI matrix. The dielectric constant of PI@BT/PI composites with 55 wt% fillers increased to 15.0 at 100 Hz, while the dielectric loss kept at low value of 0.0034, companied by a high energy density of 1.32 J·cm−3, which was 2.09 times higher than the pristine PI. Moreover, the temperature at 10 wt% weight loss reached 619°C, demonstrating the excellent thermostability of PI@BT/PI composites. In addition, PI@BT/PI composites exhibited improved breakdown strength and toughness as compared with the BT/PI composites due to the well dispersion of PI@BT nanofillers and the improved interfacial interactions between nanofillers and polymer matrix. These results provide useful information for the structural design of high-temperature dielectric materials.

scholarly journals Enhanced energy density of PVDF-based nanocomposites via a core–shell strategy

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
JingJing Xu ◽  
Chao Fu ◽  
Huiying Chu ◽  
Xianyou Wu ◽  
Zhongyang Tan ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Vinylidene Fluoride ◽  
Breakdown Strength ◽  
Electric Displacement ◽  
High Energy ◽  
High Energy Density ◽  
Core Shell ◽  
Discharge Energy ◽  
Discharge Energy Density

Abstract In recent years, high energy density polymer capacitors have attracted a lot of scientific interest due to their potential applications in advanced power systems and electronic devices. Here, core–shell structured TiO2@SrTiO3@polydamine nanowires (TiO2@SrTiO3@PDA NWs) were synthesized via a combination of surface conversion reaction and in-situ polymerization method, and then incorporated into the poly(vinylidene fluoride) (PVDF) matrix. Our results showed that a small amount of TiO2@SrTiO3@PDA NWs can simultaneously enhance the breakdown strength and electric displacement of nanocomposite (NC) films, resulting in improved energy storage capability. The 5 wt% TiO2@SrTiO3@PDA NWs/PVDF NC demonstrates 1.72 times higher maximum discharge energy density compared to pristine PVDF (10.34 J/cm3 at 198 MV/m vs. 6.01 J/cm3 at 170 MV/m). In addition, the NC with 5 wt% TiO2@SrTiO3@PDA NWs also demonstrates an excellent charge–discharge efficiency (69% at 198 MV/m). Enhanced energy storage performance is due to hierarchical interfacial polarization among their multiple interfaces, the large aspect ratio as well as surface modification of the TiO2@SrTiO3 NWs. The results of this study provide guidelines and a foundation for the preparation of the polymer NCs with an outstanding discharge energy density.

Cellulose nanofibril/boron nitride nanosheet composites with enhanced energy density and thermal stability by interfibrillar cross-linking through Ca2+

2018 ◽  
Vol 6 (4) ◽  
pp. 1403-1411 ◽  
Author(s):  
Junwei Yang ◽  
Haian Xie ◽  
Hao Chen ◽  
Zhuqun Shi ◽  
Tao Wu ◽  
...  
Keyword(s):  
Energy Density ◽  
Breakdown Strength ◽  
Dielectric Materials ◽  
High Energy ◽  
High Energy Density ◽  
Cross Linking ◽  
Cellulose Nanofibril ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Boron Nitride Nanosheet

Flexible and eco-friendly dielectric materials with high energy density and breakdown strength have promising applications in energy storage devices.

Aromatic Polythiourea with Ultrahigh Breakdown Strength for High Energy Density and Low Loss Capacitor Applications

2013 ◽  
Vol 1499 ◽  
Author(s):  
Shan Wu ◽  
Quinn Burlingame ◽  
Weiping Li ◽  
Minren Lin ◽  
Yue Zhou ◽  
...  
Keyword(s):  
Energy Density ◽  
Breakdown Strength ◽  
Dielectric Material ◽  
Film Surface ◽  
Dielectric Materials ◽  
High Energy ◽  
High Energy Density ◽  
Low Loss ◽  
Low Dielectric ◽  
Discharge Efficiency

ABSTRACTDielectric capacitors for energy storage are of great importance in modern electronics and electric systems. It is a challenge to realize the high energy density while maintain the low dielectric loss. We investigated an ultra high breakdown electric field of 1.1 GV/m, which is approaching the intrinsic breakdown, in aromatic polythiourea, a new dielectric material that serves a high energy density of 23 J/cm3 as well as high charge-discharge efficiency above 90%. The molecular structure and film surface morphology were also studied, it was proved a polar amorphous phase and glass state material could significantly suppress the high field conduction to several orders smaller compared with regular polymer dielectric materials, which are usually semi-crystalline and in rubber phase.

Tailoring the dipole properties in dielectric polymers to realize high energy density with high breakdown strength and low dielectric loss

2015 ◽  
Vol 117 (11) ◽  
pp. 114104 ◽  
Author(s):  
Yash Thakur ◽  
Minren Lin ◽  
Shan Wu ◽  
Zhaoxi Cheng ◽  
D.-Y. Jeong ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Energy Density ◽  
Breakdown Strength ◽  
High Energy ◽  
High Energy Density ◽  
Low Dielectric

scholarly journals Polymer Nanocomposites with High Energy Density Utilizing Oriented Nanosheets and High-Dielectric-Constant Nanoparticles

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4780
Author(s):  
Yushu Li ◽  
Yao Zhou ◽  
Sang Cheng ◽  
Jun Hu ◽  
Jinliang He ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Energy Density ◽  
Polymer Nanocomposites ◽  
High Dielectric Constant ◽  
Vinylidene Fluoride ◽  
Dielectric Materials ◽  
High Energy ◽  
High Energy Density ◽  
Capacitive Energy Storage ◽  
High Dielectric

The development of high-energy-density electrostatic capacitors is critical to addressing the growing electricity need. Currently, the widely studied dielectric materials are polymer nanocomposites incorporated with high-dielectric-constant nanoparticles. However, the introduction of high-dielectric-constant nanoparticles can cause local electric field distortion and high leakage current, which limits the improvement in energy density. In this work, on the basis of conventional polymer nanocomposites containing high-dielectric-constant nanoparticles, oriented boron nitride nanosheets (BNNSs) are introduced as an extra filler phase. By changing the volume ratios of barium titanate (BT) and BNNSs, the dielectric property of polymer nanocomposites is adjusted, and thus the capacitive energy storage performance is optimized. Experimental results prove that the oriented BNNSs can suppress the propagation of charge carriers and decrease the conduction loss. Using poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) as the polymer matrix, the P(VDF-HFP)/BNNS/BT nanocomposite has a higher discharged energy density compared with the conventional nanocomposite with the freely dispersed BT nanoparticles.

scholarly journals High energy density of BaTiO3@TiO2 nanosheet/polymer composites via ping-pong-like electron area scattering and interface engineering

2022 ◽  
Vol 14 (1) ◽  
Author(s):  
Gang Jian ◽  
Yong Jiao ◽  
Liang Feng ◽  
Qingzhen Meng ◽  
Ning Yang ◽  
...  
Keyword(s):  
Energy Density ◽  
Polymer Composites ◽  
Vinylidene Fluoride ◽  
Breakdown Strength ◽  
High Energy ◽  
High Energy Density ◽  
Core Shell ◽  
Interface Engineering ◽  
Hybrid Strategy ◽  
Ping Pong

AbstractDielectric substances exhibit great potential for high-power capacitors due to their high stability and fast charge–discharge; however, a long-term challenge is to enhance energy density. Here, we propose a poly(vinylidene fluoride) (PVDF) composite utilizing BaTiO3 nanoparticle@TiO2 nanosheet (BT@TO ns) 2D nanohybrids as fillers, aiming at combining the interfacial strategy of using a core–shell filler and the electron scattering of a 2D filler to improve the energy density. With 4 wt% filler, the composite possesses the largest breakdown strength (Eb) of 561.2 MV m−1, which is significantly enhanced from the 407.6 MV m−1 of PVDF, and permittivity of 12.6 at 1 kHz, which is a 23% increase from that of PVDF. A superhigh energy density of 21.3 J cm−3 with an efficiency of 61% is obtained at 550 MV m−1. The 2D BT@TO ns-filled composite exhibits a higher energy density than composites filled with core–shell 1D BT@TO nws or non-core–shell 0D BT, 1D TO, or 2D TO particles. The Eb and energy density improvements are attributed to the buffer layer-based interface engineering and enhanced area scattering of electrons caused by the 2D hybrids, an effect similar to that of a ping-pong paddle to scatter electric field-induced charge migrations in composites. Thus, an effective hybrid strategy is presented for achieving high-performance polymer composites that can be used in energy storage devices.

scholarly journals Prospects for the Development of High Energy Density Dielectric Capacitors

2021 ◽  
Vol 11 (17) ◽  
pp. 8063
Author(s):  
Andrew Burke
Keyword(s):  
Dielectric Constant ◽  
Energy Density ◽  
Breakdown Strength ◽  
High Energy ◽  
Dielectric Constants ◽  
Polymer Materials ◽  
High Energy Density ◽  
Effective Dielectric Constant ◽  
High Dielectric ◽  
Very High

In this paper, the design of high energy density dielectric capacitors for energy storage in vehicle, industrial, and electric utility applications have been considered in detail. The performance of these devices depends primarily on the dielectric constant and breakdown strength characteristics of the dielectric material used. A review of the literature on composite polymer materials to assess their present dielectric constants and the various approaches being pursued to increase energy density found that there are many papers in which materials having dielectric constants of 20–50 were reported, but only a few showing materials with very high dielectric constants of 500 and greater. The very high dielectric constants were usually achieved with nanoscale metallic or carbon particles embedded in a host polymer and the maximum dielectric constant occurred near the percolation threshold particle loading. In this study, an analytical method to calculate the dielectric constant of composite dielectric polymers with various types of nanoparticles embedded is presented. The method was applied using an Excel spreadsheet to calculate the characteristics of spiral wound battery cells using various composite polymers with embedded particles. The calculated energy densities were strong functions of the size of the particles and thickness of the dielectric layer in the cell. For a 1000 V cell, an energy density of 100–200 Wh/kg was calculated for 3–5 nm particles and 3–5 µ thick dielectric layers. The results of this study indicate that dielectric materials with an effective dielectric constant of 500–1000 are needed to develop dielectric capacitor cells with battery-like energy density. The breakdown strength would be 300–400 V/µ in a reverse sandwich multilayer dielectric arrangement. The leakage current of the cell would be determined from appropriate DC testing. These high energy density dielectric capacitors are very different from electrochemical capacitors that utilize conducting polymers and liquid electrolytes and are constructed much like batteries. The dielectric capacitors have a very high cell voltage and are constructed like conventional ceramic capacitors.

Composition-Microstructure-Property Relationships in BaTiO3 with Mg Addition

2015 ◽  
Vol 659 ◽  
pp. 58-63
Author(s):  
Oratai Jongprateep ◽  
Tunchanoke Khongnakhon ◽  
Jednupong Palomas
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Barium Titanate ◽  
High Efficiency ◽  
High Dielectric Constant ◽  
Dielectric Materials ◽  
High Energy ◽  
High Energy Density ◽  
Low Dielectric ◽  
High Dielectric

Rising worldwide demands for energy encourages development of high-efficiency energy storage and capacitor components. Main requirements for dielectric materials employed in fabrication of high energy density capacitors include high dielectric constant, high dielectric breakdown strength, and low dielectric loss. Owing to its high dielectric constant and low dielectric loss [1], barium titanate is among common capacitor materials. Tailoring of dielectric properties of barium titanate can be achieved through controlled chemical composition, microstructure, and crystal structure. Synthesis and processing techniques, as well as doping of barium titanate, can be key factors to control the composition and structure, which consequently contribute to enhancement of dielectric constant in the material.

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