Ultrafine core-shell BaTiO3@SiO2 structures for nanocomposite capacitors with high energy density

Bi, Kaiming; Bi, Meihua; Hao, Yanan; Luo, Wei; Cai, Ziming; Wang, Xiaohui; Huang, Yunhui

doi:10.1016/j.nanoen.2018.07.006

Cited by 337 publications

(192 citation statements)

References 54 publications

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“…Therefore, in order to obtain high U e , it is necessary to optimize E b and P max . [ 17–20 ] However, the most advanced commercial dielectric polymer biaxially oriented polypropylene (BOPP), due to its low dielectric constant, has a relatively low U e (≈3 J cm −3 ) even though it has a high E b . [ 21 ] Therefore, polymer composites have received great attention, and it is a common solving solution that inorganic materials with high dielectric properties and polymer matrix with high E b will be combined to obtain composites with excellent energy storage properties.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh Discharge Efficiency and High Energy Density in Sandwich Structure K_0.5Na_0.5NbO₃ Nanofibers/Poly(vinylidene fluoride) Composites

Lin

Sun

Zhan

et al. 2020

Adv Materials Inter

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fields, such as integrated capacitors, energy harvesters, and hybrid electric vehicles. [1][2][3][4][5] In order to make good use of green energy, it is important to manufacture energy storage devices or equipment with high energy density. [6] Due to the requirement of energy storage technology, advanced batteries and capacitors with high energy density have been widely studied by scientists all over the world. Compared with other stored energy equipment, electrostatic capacitors are sole stored energy facilities that can charge quickly and provide the highest power density. [7][8][9][10][11] They are critical for many modern electronics and electrical applications. [1,12] At present, the demand for compact, reliable, and efficient power systems is increasing, and high-power capacitors are one of the main enabling technologies for the development of commercial, consumer, and military systems. [13][14][15] An important factor for quantifying dielectric material performance is the energy storage density (U e ), which is calculated as:where E, P, P max , and P r represent the applied electric field, the polarization, the maximum polarization, and the remnant polarization, [16] respectively. For linear dielectrics, the formula can be used:where ε 0 , ε r, and E b represent the vacuum constant, dielectric constant, and breakdown strength, respectively. Therefore, in order to obtain high U e , it is necessary to optimize E b and P max . [17][18][19][20] However, the most advanced commercial dielectric polymer biaxially oriented polypropylene (BOPP), due to its low dielectric constant, has a relatively low U e (≈3 J cm −3 ) even though it has a high E b . [21] Therefore, polymer composites have received great attention, and it is a common solving solution that inorganic materials with high dielectric properties and polymer matrix with high E b will be combined to obtain composites with excellent energy storage properties. [22][23][24][25] The high discharge energy density and excellent discharge efficiency are important indicators for measuring the performance of the capacitor. This work systematically studies the sandwich structure ceramic/polymer composites in which the original poly(vinylidene fluoride) (PVDF) is used as the outer layer, and the one-dimensional K 0.5 Na 0.5 NbO 3 nanofibers and PVDF composites are used as the intermediate layer. The experimental results show that the energy storage performance of the composite films can be effectively improved by rationally designing and optimizing the filler content. The finite element simulation verifies that the sandwich structure composites mainly reduce the electric field strength of the intermediate layer by adding ceramic fibers, which hinder the growth of the electric trees. In addition, reasonable filler content and optimized structural design can significantly reduce the electrical conductivity, thereby achieving excellent discharge efficiency. In the optimized sandwich structure composites, the high energy density of 14.2 J cm −3 and excellent discharge ef...

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Section: Introductionmentioning

confidence: 99%

Ultrahigh Discharge Efficiency and High Energy Density in Sandwich Structure K_0.5Na_0.5NbO₃ Nanofibers/Poly(vinylidene fluoride) Composites

Lin

Sun

Zhan

et al. 2020

Adv Materials Inter

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“…To improve the compatibility between ceramic fillers and polymer matrix, different approaches have been investigated. In one approach, an ultrafine core‐shell nanostructure (~10 nm) was designed for the fillers, in which an insulating glass layer such as amorphous SiO 2 was coated on the ferroelectric nanoparticles . Because of the optimized microstructure and dielectric response, a significantly enhanced U of the nanocomposites was achieved .…”

Section: Introductionmentioning

confidence: 99%

“…In one approach, an ultrafine core‐shell nanostructure (~10 nm) was designed for the fillers, in which an insulating glass layer such as amorphous SiO 2 was coated on the ferroelectric nanoparticles . Because of the optimized microstructure and dielectric response, a significantly enhanced U of the nanocomposites was achieved . In this case, the enhancement of energy density is not only due to the existence of a high insulating layer between matrix and fillers, but also due to a large specific surface area of the ultrafine fillers .…”

Section: Introductionmentioning

confidence: 99%

“…Because of the optimized microstructure and dielectric response, a significantly enhanced U of the nanocomposites was achieved . In this case, the enhancement of energy density is not only due to the existence of a high insulating layer between matrix and fillers, but also due to a large specific surface area of the ultrafine fillers . The cost of such materials is bound to be higher, and it is not comparable with the composite materials prepared with the conventional nano‐fillers (~100 nm).…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of flexible, free‐standing, and easy‐fabricating BaTiO₃‐P(VDF‐CTFE) dielectric nanocomposite

Tong

Li²,

Liu

et al. 2019

Polymer Composites

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The flexible and free‐standing nanocomposite films were fabricated by a simple solution‐casting process using BaTiO3 nanoparticles as fillers and P(VDF‐CTFE) 91/9 mol% as polymer matrix. To obtain good wettability between ceramic and polymer, the coupling agent 3‐Aminopropyltriethoxysilane was used to modify the surface of BaTiO3 fillers. A good compatibility of BaTiO3 and P(VDF‐CTFE) was achieved when a small amount of coupling agent was used for the surface modification of BaTiO3 fillers; therefore, the nanocomposites with a dense and uniform microstructure was obtained. It was experimentally found that both dielectric constant and breakdown strength were increased with a suitable amount of coupling agent due to the good compatibility. A dielectric constant of 51 at 1 kHz was obtained with 30 vol% fillers and 2 wt% coupling agent, which was about four times of that for the pure P(VDF‐CTFE) film. When an appropriate amount of coupling agent was coated on fillers, the energy storage density of the composite system was improved. A maximal discharge energy‐storage density of 3.8 J/cm3 was obtained for the nanocomposite film with 5 vol% of BaTiO3 and 2 wt% coupling agent, which is much higher than that of the composites without coupling agent.

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“…In recent years, perovskite materials have attracted wide attention for their excellent physical properties, such as piezoelectricity, ferroelectricity, and ferromagnetism [1,2,3,4]. Owing to the adjustable crystal structure, rare-earth doping is widely used to realize novel or multifunctionality in perovskite materials [5,6].…”

Section: Introductionmentioning

confidence: 99%

Outstanding Photoluminescence in Pr3+-Doped Perovskite Ceramics

Zhang

Hao

et al. 2018

Micromachines

Self Cite

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Ba (Zr0.2Ti0.8) O3-50% (Ba0.7Ca0.3) TiO3 (BZT-0.5BCT) ceramics with different doping contents of Pr3+ were prepared by the conventional solid-state reaction. The phase structure and crystallinity of the fabricated ceramics were investigated by X-ray diffraction, Raman spectroscopy, and scanning electron microscopy. Photoluminescence (PL) emission spectra were measured to analyze the PL characteristics. The strong intensities of a green band at 489 nm and a red band at 610 nm were observed. The maximum emission intensity of the PL spectrum was achieved in the BZT-0.5BCT ceramic with 0.2% mol of Pr3+ ions. Furthermore, the PL spectra of BZT-0.5BCT ceramics were found to be sensitive to polarization of the ferroelectric ceramics. Compared with the unpoled ceramics, the green emission increased about 42% and a new emission peak at 430 nm appeared for the poled ceramics. With excellent intrinsic ferroelectricity and an enhanced PL property, such material has potential to realize multifunctionality in a wide application range.

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Ultrafine core-shell BaTiO3@SiO2 structures for nanocomposite capacitors with high energy density

Cited by 337 publications

References 54 publications

Ultrahigh Discharge Efficiency and High Energy Density in Sandwich Structure K_0.5Na_0.5NbO₃ Nanofibers/Poly(vinylidene fluoride) Composites

Ultrahigh Discharge Efficiency and High Energy Density in Sandwich Structure K_0.5Na_0.5NbO₃ Nanofibers/Poly(vinylidene fluoride) Composites

Preparation and characterization of flexible, free‐standing, and easy‐fabricating BaTiO₃‐P(VDF‐CTFE) dielectric nanocomposite

Outstanding Photoluminescence in Pr3+-Doped Perovskite Ceramics

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Ultrafine core-shell BaTiO3@SiO2 structures for nanocomposite capacitors with high energy density

Cited by 337 publications

References 54 publications

Ultrahigh Discharge Efficiency and High Energy Density in Sandwich Structure K0.5Na0.5NbO3 Nanofibers/Poly(vinylidene fluoride) Composites

Ultrahigh Discharge Efficiency and High Energy Density in Sandwich Structure K0.5Na0.5NbO3 Nanofibers/Poly(vinylidene fluoride) Composites

Preparation and characterization of flexible, free‐standing, and easy‐fabricating BaTiO3‐P(VDF‐CTFE) dielectric nanocomposite

Outstanding Photoluminescence in Pr3+-Doped Perovskite Ceramics

Contact Info

Product

Resources

About

Ultrahigh Discharge Efficiency and High Energy Density in Sandwich Structure K_0.5Na_0.5NbO₃ Nanofibers/Poly(vinylidene fluoride) Composites

Ultrahigh Discharge Efficiency and High Energy Density in Sandwich Structure K_0.5Na_0.5NbO₃ Nanofibers/Poly(vinylidene fluoride) Composites

Preparation and characterization of flexible, free‐standing, and easy‐fabricating BaTiO₃‐P(VDF‐CTFE) dielectric nanocomposite