Thermally stimulated discharge current (TSDC) characteristics in β-phase PVDF–BaTiO3 nanocomposites

Gaur, M. S.; Singh, Pramod Kumar; Ali, Asif; Singh, Rekha

doi:10.1007/s10973-014-3908-y

Cited by 24 publications

(12 citation statements)

References 29 publications

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“…As shown in Fig. 6D, the peaks located at lower temperature regions are likely associated with the MaxwellWagner effect at the filler/matrix interface (26), and the peaks at higher temperatures are attributed to the trapped charges (27). The upward shift of high-temperature peak from c-BCB/BT to c-BCB/BNNS suggests the formation of deeper traps and higher barriers against thermally activated charge carriers in c-BCB/ BNNS.…”

Section: Discussionmentioning

confidence: 90%

Sandwich-structured polymer nanocomposites with high energy density and great charge–discharge efficiency at elevated temperatures

Liu

Yang

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

328

202

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The demand for a new generation of high-temperature dielectric materials toward capacitive energy storage has been driven by the rise of high-power applications such as electric vehicles, aircraft, and pulsed power systems where the power electronics are exposed to elevated temperatures. Polymer dielectrics are characterized by being lightweight, and their scalability, mechanical flexibility, high dielectric strength, and great reliability, but they are limited to relatively low operating temperatures. The existing polymer nanocomposite-based dielectrics with a limited energy density at high temperatures also present a major barrier to achieving significant reductions in size and weight of energy devices. Here we report the sandwich structures as an efficient route to high-temperature dielectric polymer nanocomposites that simultaneously possess high dielectric constant and low dielectric loss. In contrast to the conventional single-layer configuration, the rationally designed sandwich-structured polymer nanocomposites are capable of integrating the complementary properties of spatially organized multicomponents in a synergistic fashion to raise dielectric constant, and subsequently greatly improve discharged energy densities while retaining low loss and high charge-discharge efficiency at elevated temperatures. At 150°C and 200 MV m −1 , an operating condition toward electric vehicle applications, the sandwich-structured polymer nanocomposites outperform the state-of-the-art polymer-based dielectrics in terms of energy density, power density, charge-discharge efficiency, and cyclability. The excellent dielectric and capacitive properties of the polymer nanocomposites may pave a way for widespread applications in modern electronics and power modules where harsh operating conditions are present.electrical energy storage | dielectric | polymer nanocomposites | capacitors | high temperature F ilm capacitors store electrical energy in dielectric materials in the form of an electrostatic field between two electrodes. They possess the highest power density (on the order of megawatts) and the best rate capability (on the order of microseconds) among the electrical energy storage devices and are critical for power electronics, power conditioning, and pulsed power applications (1-3). For instance, DC bus capacitors are essential components in the power inverters of electric vehicles for the conversion of direct current to alternating current, which is required to drive the vehicle's motor. Compared with ceramics, polymeric materials offer inherent advantages for capacitors, including their light weight, facile processability, scalability, high breakdown strength, and graceful failure mechanism (1-5). However, dielectric polymers often suffer from low operating temperatures, which fall short of the emerging demands for energy storage and conversion in harsh environments commonly present in automobile, aerospace power systems, and advanced microelectronics (6, 7). For example, to accommodate biaxially oriented polypropylen...

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Section: Discussionmentioning

confidence: 90%

Sandwich-structured polymer nanocomposites with high energy density and great charge–discharge efficiency at elevated temperatures

Liu

Yang

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

328

202

View full text Add to dashboard Cite

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“…And it is the interaction of multiple polarizations in high polymer that have a significant effect on electrical properties of polymer, such as dielectric properties and pyroelectric properties. [16][17][18] Then the introduction of BCZT will bring following changes for the PVDF matrix: (1) the introduction of BCZT will increase the interfaces between organic and inorganic materials. Therefore, the hybrid and inorganic doped PVDF have attracted increasing attention due to its excellent performance.…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13][14][15] Relevant research also pointed out that the improvements of electrical properties are closely related to the changes of inner charge carrier trap and polarization mechanism for the dielectric materials. [16][17][18] Then the introduction of BCZT will bring following changes for the PVDF matrix: (1) the introduction of BCZT will increase the interfaces between organic and inorganic materials. Consequently, there will be more SC accumulation in the interfaces.…”

Section: Introductionmentioning

confidence: 99%

Polarization and space charge performance in PVDF with MPB composition BCZT doped composite films

Liu

Lin

et al. 2017

J of Applied Polymer Sci

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The morphotropic phase boundary composition 47(Ba 0.7 Ca 0.3 )TiO 3 -0.53Ba(Zr 0.2 Ti 0.8 )O 3 (calcium barium zirconate titanate, BCZT) were doped in poly(vinylidene fluoride) matrix by solution casting method. The effect of BCZT particles on polarization characteristics of composite films were investigated through dielectric spectra, hysteresis, and thermally stimulated discharge current measurements. It reveals that relative dielectric constant, remnant polarization, and energy storage density gradually increase and reach the maximum value with 39 at 100 Hz, 1.17 lC/cm 2 , and 3.69 J/cm 3 at the concentration of 20 vol % BCZT. The Gaussian method was employed to decompose thermally stimulated discharge current composite peaks and an approximate model was used to analyze the activation energy levels of these films. The results indicated that the introduction of BCZT is effective for the charge carrier traps and activation energy distribution in the relaxation process of composite films. The decreased molecular movements, and increased interfaces formed between the BCZT grains and the poly(vinylidene fluoride) matrix may be responsible for these performances. And a new relaxation peak appeared at about 370 K in composites when BCZT concentration exceeded 20 vol %, which was considered to be caused by the ferroelectric-paraelectric phase transition of BCZT.

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“…The XRD peaks corresponding to crystal planes (020) and (110) which firstly appear at 150°C for F7MP3 are due to chain aggregation in the early stage of crystallization. Specifically, when PVDF became the dispersed phase as F3MP7, the chain growth to extent the lamellar crystal will be hindered by the matrix block copolymer according to Lauritzen-Hoffman theory, so that the XRD peaks corresponding to crystal planes (100) and (120) are weakened to be seen [36]. Table 3.…”

Section: Results and Discussion X-ray Scatteringmentioning

confidence: 99%

Crystallization behaviors of poly(vinylidene fluoride) and poly(methyl methacrylate)-block-poly(2-vinyl pyridine) block copolymer blends

Wang

Chen

2016

J Therm Anal Calorim

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In this study, blends of poly(vinylidene fluoride) and different contents of poly(methyl methacrylate)-block-poly(2-vinyl pyridine) block copolymer (BCP) (PMMA-b-P2VP) are prepared by solution mixing. The phase separation and crystallization behaviors of PVDF and PMMA-b-P2VP blends were characterized by X-ray scattering from small angle to wide angle at different annealing temperatures. The non-isothermal crystallization kinetics of the blends is investigated by differential scanning calorimetry (DSC). During the non-isothermal cooling process, PVDF in blends has higher onset crystallization temperature than that of pure PVDF, which may be attributed to a weak phase separation seen from X-ray scattering patterns, in favor of the nucleation of PVDF. A unique crystallization behavior in DSC test is that as the PVDF content in the blends is dispersed as 30 mass%, degree of crystallinity turns out to be the highest among the blends, even higher than PVDF itself, although the crystallization rate is decreasing with the BCP content. By a novel treatment of dividing the X t * t plot to three stages, it can be found that the relative degree of crystallinity at the end of nucleation process can be responsible for the unusual crystallization behavior. Incorporation of BCP definitely increases the hydrophilic property of PVDF materials by water contact angle test. Understanding of PVDF crystallization in the system with BCP guides the further development of high-performance PVDF membrane materials.

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Thermally stimulated discharge current (TSDC) characteristics in β-phase PVDF–BaTiO3 nanocomposites

Cited by 24 publications

References 29 publications

Sandwich-structured polymer nanocomposites with high energy density and great charge–discharge efficiency at elevated temperatures

Sandwich-structured polymer nanocomposites with high energy density and great charge–discharge efficiency at elevated temperatures

Polarization and space charge performance in PVDF with MPB composition BCZT doped composite films

Crystallization behaviors of poly(vinylidene fluoride) and poly(methyl methacrylate)-block-poly(2-vinyl pyridine) block copolymer blends

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