scholarly journals Advancing Dielectric and Ferroelectric Properties of Piezoelectric Polymers by Combining Graphene and Ferroelectric Ceramic Additives for Energy Storage Applications

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1553 ◽  
Author(s):  
Saira Ishaq ◽  
Farah Kanwal ◽  
Shahid Atiq ◽  
Mahmoud Moussa ◽  
Umar Azhar ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Energy Storage ◽  
Barium Titanate ◽  
Polyvinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Weight Ratio ◽  
Ferroelectric Ceramic ◽  
Nanocomposite Films ◽  
Piezoelectric Polymers ◽  
Energy Storage Applications

To address the limitations of piezoelectric polymers which have a low dielectric constant andto improve their dielectric and ferroelectric efficiency for energy storage applications, we designed and characterized a new hybrid composite that contains polyvinylidene fluoride as a dielectric polymer matrix combined with graphene platelets as a conductive and barium titanite as ceramic ferroelectric fillers. Different graphene/barium titanate/polyvinylidene fluoride nanocomposite films were synthesized by changing the concentration of graphene and barium titanate to explore the impact of each component and their potential synergetic effect on dielectric and ferroelectric properties of the composite. Results showed that with an increase in the barium titanate fraction, dielectric efficiency ofthe nanocomposite was improved. Among all synthesized nanocomposite films, graphene/barium titanate/polyvinylidene fluoride nanocomposite in the weight ratio of 0.15:0.5:1 exhibited thehighest dielectric constant of 199 at 40 Hz, i.e., 15 fold greater than that of neat polyvinylidene fluoride film at the same frequency, and possessed a low loss tangent of 0.6. However, AC conductivity and ferroelectric properties of graphene/barium titanate/polyvinylidene fluoride nanocomposite films were enhanced with an increase in the graphene weight fraction. Graphene/barium titanate/polyvinylidene fluoride nanocomposite films with a weight ratio of 0.2:0.1:1 possessed a high AC conductivity of 1.2 × 10−4 S/m at 40 Hz. While remanent polarization, coercive field, and loop area of the same sample were 0.9 μC/cm2, 9.78 kV/cm, and 24.5 μC/cm2·V, respectively. Our results showed that a combination of graphene and ferroelectric ceramic additives are an excellent approach to significantly advance the performance of dielectric and ferroelectric properties of piezoelectric polymers for broad applications including energy storage.

Design strategy of barium titanate/polyvinylidene fluoride-based nanocomposite films for high energy storage

2020 ◽  
Vol 8 (3) ◽  
pp. 884-917 ◽  
Author(s):  
Yan Wang ◽  
Minggang Yao ◽  
Rong Ma ◽  
Qibin Yuan ◽  
Desuo Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Energy Storage ◽  
Barium Titanate ◽  
Nanocomposite Film ◽  
Polyvinylidene Fluoride ◽  
Design Strategy ◽  
High Energy ◽  
Nanocomposite Films ◽  
Electronic Components ◽  
High Energy Storage

Barium titanate/polyvinylidene fluoride- (BT/PVDF-) based nanocomposite film exhibits excellent energy storage and mechanical properties and can be used as flexible electronic components.

Preparation and Dielectric Property of Al2O3 Surface Coating Modified BaTiO3/Polyimide Composite Film

2014 ◽  
Vol 908 ◽  
pp. 63-66
Author(s):  
Ya Jun Wang ◽  
Xiao Juan Wu ◽  
Chang Gen Feng
Keyword(s):  
Dielectric Constant ◽  
Barium Titanate ◽  
Composite Film ◽  
Breakdown Strength ◽  
In Situ Polymerization ◽  
Chemical Properties ◽  
Dielectric Strength ◽  
Xrd Analysis ◽  
Nanocomposite Films ◽  
The Matrix

Polyimide (PI) was chosen as the matrix of the composite, barium titanate/polyimide (BT/PI) nanocomposite films were prepared by in situ polymerization. In order to improve the dispersion and the physical-chemical properties of BT surface, barium titanate was modified by Al2O3coating and modified BT/PI nanocomposite films were prepared. The prepared modified BT was characterized by X-ray diffraction (XRD) analysis, and scanning electron microscopy (SEM), and the dielectric properties of the composites were characterized in detail. It was shown that surface modification with Al2O3is the chemical process and there were new substances forming. When BT was modified by 10 wt% Al2O3, the dielectric constant of the composite film was 18.96 (103Hz), the loss tangent 0.005, breakdown strength 70 MV·m-1, energy storage density 0.41 J·cm-3. The dielectric constant of BT modified by Al2O3is decreased while the dielectric strength of the modified BT/PI composite film is increased.

Dipole-relaxation dynamics in a modified polythiourea with high dielectric constant for energy storage applications

2019 ◽  
Vol 115 (16) ◽  
pp. 163901 ◽  
Author(s):  
Chao Wu ◽  
Zongze Li ◽  
Gregory M. Treich ◽  
Mattewos Tefferi ◽  
Riccardo Casalini ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Energy Storage ◽  
High Dielectric Constant ◽  
Relaxation Dynamics ◽  
Dipole Relaxation ◽  
Energy Storage Applications ◽  
High Dielectric

scholarly journals Investigating the dielectric properties of barium titanate nanocomposites using transmission electron microscopy image processing

MRS Advances ◽  
2021 ◽  
Author(s):  
Gio Ferro ◽  
Dithi Ganjam ◽  
Maia Gibson ◽  
Katie Partington ◽  
Akshay Trikha ◽  
...  
Keyword(s):  
Image Processing ◽  
Dielectric Constant ◽  
Energy Storage ◽  
Barium Titanate ◽  
Computational Models ◽  
Transmission Electron Microscopy Image ◽  
Dielectric Behavior ◽  
Dielectric Constants ◽  
Transmission Electron ◽  
High Dielectric

AbstractBarium titanate (BTO) is a ferroelectric perovskite material used in energy storage applications because of its high dielectric constant. A previous study showed that the dielectric constant for BTO nanoparticles drastically increases to over 15,000 at a particle size of 70 nm. This result is highly contested, but its implications to energy storage motivated our investigation into the dielectric constants of BTO nanoparticles that are incorporated into a polymer matrix. We developed a novel method of using image processing techniques on transmission electron microscope images of BTO-polymer nanocomposites. Data on the positions, shapes, sizes, and orientations of BTO nanoparticles were used to build more realistic computational models that simulate the dielectric behavior of the nanocomposites. Here, we investigate the relationship between regions of enhanced electric field and the composite dielectric constant.

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