Ultrahigh energy storage performance of a polymer-based nanocomposite <i>via</i> interface engineering

Wang, Peng; Pan, Zhongbin; Wang, Weilin; Hu, Jianxu; Liu, Jinjun; Yu, Jinhong; Zhai, Jiwei; Chi, Qingguo; Shen, Zhonghui

doi:10.1039/d0ta10044g

Cited by 31 publications

(20 citation statements)

References 60 publications

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“…The large divergence in K of ceramic fillers and polymer is known to aggravate the local distortion of electric field and yield highly inhomogeneous field distribution, and consequently, greatly reduce the breakdown strength of the composites. [31][32][33] Additionally, this approach takes advantage of the wide bandgap feature of the Al 2 O 3 shell (≈8.8 eV vs ≈5.8 eV of ZrO 2 ) [26] to create a high barrier in the energy level and limit electrical conduction, which is the main loss mechanism of dielectrics operating at high fields and elevated temperatures. [34,35] Moreover, compared with the organic shells, which could induce extra loss due to molecular relaxation and relatively poor stability at high temperatures, [7,8,35] the inorganic shell is anticipated to endow better thermal stability and low energy loss of the nanofillers at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

High‐Temperature High‐Energy‐Density Dielectric Polymer Nanocomposites Utilizing Inorganic Core–Shell Nanostructured Nanofillers

Ren

Xie

et al. 2021

Advanced Energy Materials

175

143

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Compared to electrochemical energy devices such as batteries and supercapacitors, dielectric film capacitors have greater power densities and faster charging and discharging rates and are the essential components in power electronics. [4][5][6] Dielectric polymers possess unique features in comparison to their ceramic counterparts, including high breakdown strength, low dielectric loss, facile preparation, and graceful failure mechanism, which make them the materials of choice for scalable high-energy-density capacitors. [7][8][9][10][11] More recently, there is an urgent demand for dielectric materials capable of operating efficiently at elevated temperatures, e.g., 150 °C, in advanced electronics, electrified vehicles, and aerospace power systems. However, dielectric polymers are limited to relatively low working temperatures. [11][12][13][14][15] For example, the operation temperature of biaxially oriented polypropylene (BOPP), the industrial benchmark dielectric polymer, is well below 105 °C under the applied electric fields. [15] A variety of innovative approaches, including the incorporation of wide bandgap inorganic fillers, [16][17][18] deposition of ceramic coatings onto polymer films, [19][20][21] addition of high-electronaffinity molecular semiconductors, [22] and utilization of multilayer-structured films, [23][24][25] have been developed to improve the high-temperature capacitive performance of dielectric polymers. While these approaches are effective in hindering electrical conduction and reducing energy loss at high fields and elevated temperatures, the energy densities of the current high-temperature dielectric composites are limited (below 4 J cm −3 in most cases) owing to relatively low dielectric constant (K) values of the fillers, such as ≈3.5-4 of SiO 2 and boron nitride nanosheets (BNNSs) [16,26] and ≈7.9-10 of Al 2 O 3 . [26] On the other hand, the direct introduction of high-K inorganic fillers, such as TiO 2 with a K of 110 (ref. [27]) and BaTiO 3 with a K of ≈3000 (ref. [28]), into dielectric polymers with the goal of increasing the energy density has yielded very high energy loss and largely reduced chargedischarge efficiency (η) with increasing applied field and temperature. [29,30] For instance, at an applied field of 400 MV m −1 , the η of the polyimide composites with 1 vol% BaTiO 3 nanofibers is only 55% at 150 °C versus 92% at 25 °C. [30] Herein, we present High-energy-density polymer dielectrics capable of high temperature operation are highly demanded in advanced electronics and power systems. Here, the polyetherimide (PEI) composites filled with the core-shell structured nanoparticles composed of ZrO 2 core and Al 2 O 3 shell are described. The establishment of a gradient of the dielectric constants from ZrO 2 core and Al 2 O 3 shell to PEI matrix gives rise to much less distortion of the electric field around the nanoparticles, and consequently, high breakdown strength at varied temperatures. The wide bandgap Al 2 O 3 shell creates deep traps in the composites and thus yields ...

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Section: Introductionmentioning

confidence: 99%

High‐Temperature High‐Energy‐Density Dielectric Polymer Nanocomposites Utilizing Inorganic Core–Shell Nanostructured Nanofillers

Ren

Xie

et al. 2021

Advanced Energy Materials

175

143

View full text Add to dashboard Cite

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“…[ 1 ] Up to now, one of the most promising candidates for the storage and conversion of pulsed energy is polymer‐based dielectric capacitors that have ultrafast charge/discharge rate, ultrahigh power densities, durable cycle lifetime, and excellent cycling stabilities. [ 2,3 ] Despite these advantages, the discharge energy densities ( U d ) of dielectric capacitors are much lower than supercapacitors and lithium‐ion batteries. Therefore, the key technology for the wide application of dielectric capacitors is to achieve high U d .…”

Section: Introductionmentioning

confidence: 99%

Largely Improved Breakdown Strength and Discharge Efficiency of Layer‐Structured Nanocomposites by Filling with a Small Loading Fraction of 2D Zirconium Phosphate Nanosheets

Liang

Shi

Tan

et al. 2021

Adv Materials Inter

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Dielectric film capacitors have aroused considerable attention on account of the fast development of pulsed power systems. However, enhanced energy density is always acquired at the cost of deteriorated charge/discharge efficiency. Herein, well balanced energy density and efficiency are achieved in a series of reasonably designed bilayer composites consisting of a ferroelectric layer and a paraelectric layer at the meantime. It is interesting to find that, when merely 1.6 wt% Zr(HPO4)2 nanosheets are introduced into the ferroelectric layer, a substantially improved energy density of 11.22 J cm−3, which is about 165% that of the bilayer composite without Zr(HPO4)2 nanosheets, is achieved at 650 kV mm−1. Meanwhile, a high charge/discharge efficiency of 89.8% and a low loss tangent of 0.024@10 kHz which is much lower than the pristine ferroelectric polymer layer (0.058@10 kHz) is maintained. Furthermore, finite element simulation reveals that the electric breakdown paths will develop along the macroscopical‐interfaces between adjoining layers and the microcosmic‐interfaces between the Zr(HPO4)2 nanosheets and polymer matrix, which can effectively increase the length of breakdown paths and contribute to improved breakdown strength. This work demonstrates that the Zr(HPO4)2 nanosheets can be promising fillers for other high‐performance dielectric composites.

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“…Second, compared with unstretched P(VDF-HFP) films, the P(VDF-HFP)-S with oriented fiber-like crystals exhibit a high E b and polarization, which is helpful to improve the energy-storage performance of dielectric films. Figure b shows energy-storage performance for different dielectrics reported recently. ,,,,,− From this comparison picture, the stretched films prepared in this contribution simultaneously exhibit high U e and high E b , compared with the reported all-organic films with a multilayer structure. Additionally, the energy-storage density of stretched 0-25-0-S is also comparable to multilayer-structure dielectric films containing inorganic fillers, implying that dielectric properties synergy of the dielectric layer and insulating layers is an effective method to improve the capacitive performance of dielectric films.…”

Section: Results and Discussionmentioning

confidence: 65%

Dielectric Properties’ Synergy of Stretched P(VDF-HFP) and P(VDF-HFP)/PMMA Blends Creates Ultrahigh Capacitive Energy Density in All-Organic Dielectric Films

Sun

Shi

Zhang

et al. 2022

ACS Appl. Energy Mater.

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Dielectric capacitors with a high energy-storage density and efficiency are urgently required for miniaturization and integration of power electronics and pulsed power system. Herein, single-layered stretched P(VDF-HFP) with a certain content of poly(methyl methacrylate) (PMMA) and two kinds of sandwich-structured films are prepared to optimize and compare energy-storage performance. The results revealed that the crystallization transition behavior of stretched P(VDF-HFP) films contributed to enhance its electric polarization, while the introduction of linear type PMMA resulted in an enhancement of voltage tolerance of stretched films by improving the mechanical properties and suppressing leakage current. What’s more, the effects of crystalline orientations and structure design on the breakdown mechanism of stretched films were revealed by finite element theoretical simulation. As a consequence, the stretched sandwich-structured 0-25-0-S (pure P(VDF-HFP) serves as the outer layer, and blends represent the middle layer; the digit representing PMMA content in the P(VDF-HFP)) displayed a high U e of 28.71 J/cm3 and η of 74% under 680 MV/m. This work provides a workable and effective method for developing capacitive films with great energy-storage performance.

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Ultrahigh energy storage performance of a polymer-based nanocomposite via interface engineering

Abstract: Multiscale internal/external interfaces are constructed to break the paradox of a high dielectric constant with decreased breakdown strength for superior energy storage capability. An ultrahigh discharged energy density of ∼25.26 J cm−3 is achieved.

Cited by 31 publications

References 60 publications

High‐Temperature High‐Energy‐Density Dielectric Polymer Nanocomposites Utilizing Inorganic Core–Shell Nanostructured Nanofillers

High‐Temperature High‐Energy‐Density Dielectric Polymer Nanocomposites Utilizing Inorganic Core–Shell Nanostructured Nanofillers

Largely Improved Breakdown Strength and Discharge Efficiency of Layer‐Structured Nanocomposites by Filling with a Small Loading Fraction of 2D Zirconium Phosphate Nanosheets

Dielectric Properties’ Synergy of Stretched P(VDF-HFP) and P(VDF-HFP)/PMMA Blends Creates Ultrahigh Capacitive Energy Density in All-Organic Dielectric Films

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