Ultrahigh discharged energy density in polymer nanocomposites by designing linear/ferroelectric bilayer heterostructure

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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“…Compared with the recently reported PVDF‐based composites in Table 1 , the as‐prepared KNN‐nfs/PVDF composites show excellent ESPs. [ 53–57 ]…”

Section: Resultsmentioning

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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“…Xie et al 247 developed a linear/ferroelectric bilayer-heterostructured polymer nanocomposite with an ultra-high discharged energy which exhibited an enhanced breakdown strength and a large difference between the maximum dielectric displacement and remnant polarization (D max -P r ). The enhancement was attributed to the interfacial barrier and the interfacial polarization effect at the interface of two layers.…”

Section: Polarization Mechanismmentioning

confidence: 99%

Interface design for high energy density polymer nanocomposites

et al. 2019

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“…Film capacitors, comprising dielectric materials sandwiched between metallic electrodes, provide extraordinary charging‐discharging rate and high power density for the modern electrical power systems . The rise of high‐power applications such as electric vehicles, aircraft, and pulsed power systems exposed to elevated temperatures drives the demand for a new generation of high‐temperature dielectric materials .…”

Section: Introductionmentioning

confidence: 99%

Bioinspired Polymer Nanocomposites Exhibit Giant Energy Density and High Efficiency at High Temperature

Liu

Chen

et al. 2019

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Polymer dielectrics are ubiquitous in advanced electric energy storage systems. However, the relatively low operating temperature significantly menaces their widespread application at high temperatures, such as for hybrid vehicles and aerospace power electronics. Spider silk, a natural nanocomposite comprised of biopolymer chains and crystal protein nanosheets combined by multiple interfacial interactions, exhibits excellent mechanical properties even at elevated temperatures. Inspired by the hierarchical nanostructure of spider silk, poly(aryl ether sulfone) is anchored to the surface of wide bandgap artificial nanosheets to prepare the nanocomposites with nanoconfinement effect. The bioinspired strategy successfully improves the mechanical and electrical performances of the nanocomposite. Owing to the structural‐enabled enhancements, the nanocomposites exhibit excellent breakdown strength and electrical energy storage performance at high temperatures. In detail, giant discharged energy density (2.7 J cm−3) and high charge–discharge efficiency (>90%) are simultaneously achieved at 150 °C and 400 MV m−1. Notably, under 500 MV m−1, the discharged energy density reaches 4.2 J cm−3, which is the record high discharged energy density among polymer‐based dielectrics at 150 °C. This work demonstrates a viable strategy to design high‐temperature polymer dielectrics by constructing nanoconfinement in the nanocomposites.

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Ultrahigh discharged energy density in polymer nanocomposites by designing linear/ferroelectric bilayer heterostructure

Cited by 142 publications

References 55 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

Interface design for high energy density polymer nanocomposites

Bioinspired Polymer Nanocomposites Exhibit Giant Energy Density and High Efficiency at High Temperature

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Ultrahigh discharged energy density in polymer nanocomposites by designing linear/ferroelectric bilayer heterostructure

Cited by 142 publications

References 55 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

Interface design for high energy density polymer nanocomposites

Bioinspired Polymer Nanocomposites Exhibit Giant Energy Density and High Efficiency at High Temperature

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