The lead-free dielectric capacitors with high-temperature stability, high energy storage density and high discharge efficiency are highly needed for pulse power and power electronic applications. In this regard, Ba0.7Sr0.3TiO3–PVDF (Polyvinylidene fluoride) ceramic-polymer composites have been synthesized using a cold sintering process. …
The polyvinylidene fluoride (PVDF) thick film has been fabricated by a solution casting method. The fabricated film is subjected to annealing at 50, 90, 100, 110 and 130 °C for 5 h. The effect of annealing on structural, crystalline, dielectric and polarization behavior is investigated. The β-phase PVDF is found to coexist with α-phase …
As the temperature increases, the energy available for the PVDF chains to align in a more ordered manner increases, resulting in a higher β-phase fraction. Finally, the ANN model shows that the input parameters (150, 90, 100, 30) gives the highest β-phase fraction (94%), confirming again the ANOVA results.
Power & Energy Storage System Research Center, College of Mechanical and Electrical Engineering, Qingdao University, Qingdao, China Correspondence Jian Min Zhang, National Engineering Research Center for Intelligent Electrical Vehicle Power System (Qingdao), Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China.
PVDF undergoes a structural evolution during annealing over a wide range of temperature between Tg and Tm. The organization that develops during such annealing can be destroyed at a slightly higher temperature, yielding a small endotherm on the DSC trace centered at Tmlow. The kinetics of the phenomenon, as seen through the Tmlow …
Herein, an efficient way to enhance dielectric and ferroelectric properties of PVDF films by annealing preoriented PVDF films through thermal treatment combined with the pressure field is proposed. …
3.1 Sample characterizationThe crystalline phases of PVDF can be characterized by the infrared absorption bands between 400 and 1000 cm −1 [6, 10, 15–18] gure 1 shows the IR spectra of samples crystallized at different condition. The bands at 483 and 879 cm −1 are attributed to the amorphous phase of PVDF, and can …
The composites with less hysteresis have good energy storage properties [24]. In this paper we report dielectric, polarization and energy storage behaviour of PVDF-CCTO nanocomposite films. The CCTO filler are nanosized powder in …
Besides the breakdown strength and dielectric constant, dielectric polarisation behaviours also have a major impact on the energy storage performance. For instance, despite the combination of both high K (∼8–10) and high breakdown strength (>500 MV m −1) in PVDF, they are practically of low energy density (∼5 J cm −3 at 350 …
Therefore, we verified that the PVDF@SiO 2 –PVDF composite film has a high discharge energy density of 12.051 J/cm 3 when the PVDF@SiO 2 is 40 wt %. In addition, the domain size is limited by the silica shell, …
With increasing annealing temperature (Tanneal), the magnitude of the electric fields for the antiferroelectric‐to‐ferro‐electric (EAF) and ferroelectric‐to‐antiferroelectric (EFA) transition of a 9.2 nm thick Hf0.3Zr0.7O2 film decreased. The energy storage densities of the Hf0.3Zr0.7O2 films crystallized at 400 …
2.1. Calculation of energy density and efficiency The integral of the electric field between remnant polarization and maximum dielectric displacement is defined as the dielectric materials energy density as indicated in Eq. (1) (1) U e = ∫ P r P m a x E d D where U e is the energy density, the field of electricity is denoted by the letter E, the electric …
The two-parameter Weibull analysis, which can be describe as P(E) = 1-exp(-(E/E b) β), was performed to study the breakdown strengths of all organic multilayer dielectrics.P(E) is the cumulative probability of electric failure, E is measured breakdown strength, E b is characteristic breakdown strength at which the probability of dielectric …
Structural characterization carried out using X-ray diffraction studies confirmed the formation of PVDF-ZnO and PVDF-TZO nanocomposite thin films as the diffraction peaks (110) and (200) belonging ...
Therefore, at the optimal HFP/TrFE ratio of 2/1, a high breakdown strength of 694.8 kV mm −1 and discharged energy density of U e of ∼23.6 J cm −3 have been achieved, with a high energy density of 27.8 J cm −3 and power of 10.7 MW cm −3 delivered to a 20
The plot is given in Fig. 1 (b) shows the comparison of various electric energy storage devices in terms of the power density v/s energy density, is called the Ragone plot. Due to the properties mentioned above, the supercapacitor can fill the power-energy gap between the old-fashioned ordinary capacitor and the new-generation …
In this article, effect of annealing temperature on morphology of polymer chains and structure of crystalline-phase in P(VDF-TrFE) ... Structural evolution of PVDF during storage or annealing Polymer (2004) J.S. …
Compared with the normal PVDF film, the crystallization temperature (T c) of the PVDF films prepared from the water-environmental treatment PVDF powder moves …
In this paper, we investigate the effect of thermal annealing on the degree of crystallinity, the fraction of electro-active phase (β-phase) and the dielectric properties, …
The discharge energy density of the PVDF/P(VDF−CTFE) (70/30) film is more than twice that of pure PVDF due to the increase of phases α and γ and the decrease of crystallinity. Under the breakdown electric field (380 kV mm −1 ), PVDF/P(VDF−CTFE) (70/30) film also has an ultrahigh energy storage efficiency of 64%.
Meanwhile, due to the PVDF P&H-160 showing the optimal energy storage properties, the temperature of the P&H cycle was set at 160 C for the subsequent preparation of MF/PVDF P&H-160 composites. Download : …
The optimization of the processing condition of polyvinylidene fluoride (PVDF) plays a pivotal role in determining the structural, dielectric, and energy storage …
2.1. Calculation of energy density and efficiency The integral of the electric field between remnant polarization and maximum dielectric displacement is defined as the dielectric materials energy …
Arshad et al. annealed PVDF thin films from 70 to 170 C, which shows 70 C is the favorable annealing temperature for PVDF thin films with high dielectric constant, low tangent loss, and high ...
Polymer nanocomposites have proved to be promising energy storage devices for modern power electronic systems. In this work we have studied the dielectric properties and dielectric energy storage densities of 0–3 type BCZT/PVDF-HFP polymer nanocomposites with different filler volume concentrations. BCZT nanopowder was …
This work systematically uncovers how the heat- processing (annealing and quenching) impacts the phase evolutions of the PVDF films and further to correlate …
The results show the BZCT@SiO 2 /PVDF composites with a 3% volume fraction filling exhibit excellent energy storage performance, with a breakdown strength …
The β-phase PVDF is found to coexist with α-phase for annealing temperature upto 100 C, after that β-phase is converted to α-phase. The dielectric permittivity and tangent loss of film in the frequency range of 10 3 Hz to 10 5 Hz annealed at 100°C are 11 and 0.025 respectively.