scholarly journals Understanding Dielectrics: Impact of External Salt Water Bath

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2033
Author(s):  
Jonathan Phillips ◽  
Alexander Roman
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Parallel Plate ◽  
Dielectric Material ◽  
Salt Water ◽  
Low Frequency ◽  
Ambient Air ◽  
Dielectric Materials ◽  
Standard Theory ◽  
Parallel Plate Capacitor

As predicted by the theory of super dielectric materials, simple tests demonstrate that dielectric material on the outside of a parallel plate capacitor dramatically increases capacitance, energy density, and power density. Simple parallel plate capacitors with only ambient air between the plates behaved as per standard theory. Once the same capacitor was partially submerged in deionized water (DI), or DI with low dissolved NaCl concentrations, still with only ambient air between the electrodes, the capacitance, energy density, and power density, at low frequency, increased by more than seven orders of magnitude. Notably, conventional theory precludes the possibility that material outside the volume between the plates will in any fashion impact capacitive behavior.

Aromatic Polythiourea with Ultrahigh Breakdown Strength for High Energy Density and Low Loss Capacitor Applications

2013 ◽  
Vol 1499 ◽  
Author(s):  
Shan Wu ◽  
Quinn Burlingame ◽  
Weiping Li ◽  
Minren Lin ◽  
Yue Zhou ◽  
...  
Keyword(s):  
Energy Density ◽  
Breakdown Strength ◽  
Dielectric Material ◽  
Film Surface ◽  
Dielectric Materials ◽  
High Energy ◽  
High Energy Density ◽  
Low Loss ◽  
Low Dielectric ◽  
Discharge Efficiency

ABSTRACTDielectric capacitors for energy storage are of great importance in modern electronics and electric systems. It is a challenge to realize the high energy density while maintain the low dielectric loss. We investigated an ultra high breakdown electric field of 1.1 GV/m, which is approaching the intrinsic breakdown, in aromatic polythiourea, a new dielectric material that serves a high energy density of 23 J/cm3 as well as high charge-discharge efficiency above 90%. The molecular structure and film surface morphology were also studied, it was proved a polar amorphous phase and glass state material could significantly suppress the high field conduction to several orders smaller compared with regular polymer dielectric materials, which are usually semi-crystalline and in rubber phase.

scholarly journals Frequency response analysis of dielectric materials in a parallel-plate transmission line

2021 ◽  
Vol 22 (2) ◽  
pp. 893
Author(s):  
Aaron Don Munsayac Africa ◽  
Gregory James Pe ◽  
Robert Ianny Roy Quijano
Keyword(s):  
Transmission Line ◽  
Frequency Response ◽  
Transmission Lines ◽  
Parallel Plate ◽  
Dielectric Material ◽  
Signal Transmission ◽  
Sheet Material ◽  
Dielectric Materials ◽  
Response Analysis ◽  
Parallel Plates

A transmission line allows different frequencies to conduct alternating current (AC). They are a peculiar type of wire that allows signal transmission while making it resistant to external noises. A parallel-plate transmission line is a type of transmission line designed with two parallel plates with a dielectric sheet material in the center, as the name implies. The parallel-plate transmission lines are usually used for a miniature setup in which the line prevents the signal from losing power. However, the line's frequency response is a varying setup in which a change in a parameter can fully change the frequency response of the line, and in turn trigger inefficiency. With this, different factors such as the conductor, the size, and the dielectric material of the parallel-plate transmission line can affect its frequency response. Specifically, the analysis of the transmission would test the various frequency responses when the dielectric sheet content is varied. The researchers will carry out experiments on air, Teflon, plexiglass, and E type glass dielectrics.

Theoretical and experimental basis for the super dielectric model of dielectric materials

2020 ◽  
Vol 33 (3) ◽  
pp. 306-318
Author(s):  
Jonathan Phillips
Keyword(s):  
Field Theory ◽  
Parallel Plate ◽  
Dielectric Material ◽  
Dielectric Materials ◽  
Theory Model ◽  
Stored Energy ◽  
Basic Field ◽  
Extra Charge ◽  
The Standard Model ◽  
Material Theory

Two theories of the fields generated by charges on parallel plate capacitors, the standard model (SM) found in virtually all text books and the recently proposed super dielectric material-theory (SDM-Theory), are described, and contrasted, in terms of theory and experimentally tested predictions. Only the SDM-Theory model is found to be consistent with thermodynamics, basic field theory, and experimental results. According to the SM, dielectrics in the volume between the electrodes of a parallel plate capacitor store the energy in a capacitor in the form of greatly, relative to the no dielectric case, increased electric field strength. This model is shown to be inconsistent with path independent changes in state property (e.g., voltage), and predicts, incorrectly, that dielectric material outside the volume between the electrodes will have no effect on any measurable properties such as capacitance and energy density. In contrast, according to SDM-Theory, a theory shown to be consistent with path independent changes in state properties, as well as “conservative field theory,” the increased stored energy in the presence of dielectrics is not associated with energy in fields, but rather it is due to the “extra” charges stored on the electrodes. The extra charge is required to create a given net field in the presence of a dielectric. Indeed, according to SDM-Theory, the effect of dielectric material, because its polarization is opposite to the electrodes, reduces the net field at all points in space, including within the volume of the dielectric. This is the absolute opposite of the “action” of a dielectric predicated by the SM. In the SDM-Theory, at a given capacitor voltage, virtually identical net fields exist with and without a dielectric, but the capacitance (amount of stored charge) and stored energy, a linear function of the amount of stored charge, of the latter configuration can be many orders of magnitude greater. Moreover, SDM-Theory predicts, consistent with recent observations, that dielectric material external to the volume between electrodes should be nearly as effective at increasing capacitance, etc., as the same dielectric material between the electrodes.

Relative complex permittivity and its dependence on frequency

2017 ◽  
Vol 14 (6) ◽  
pp. 532-537
Author(s):  
Georgios Giannoukos ◽  
Mart Min ◽  
Toomas Rang
Keyword(s):  
Dielectric Properties ◽  
Complex Permittivity ◽  
Parallel Plate ◽  
Dielectric Material ◽  
Parallel Plates ◽  
Parallel Plate Capacitor ◽  
Content Type ◽  
Dielectric Characterization ◽  
Plate Capacitor ◽  
The Way

Purpose This paper aims to give a brief overview of dielectric properties, relative complex permittivity and its dependence on frequency. The significance of different approaches to complex permittivity is also discussed. Design/methodology/approach The different mechanisms of polarization are then presented. Dielectric measurements are given, and an RC parallel-equivalent circuit is used to simulate a parallel plate capacitor, and the way in which the impedance of the circuits is affected by frequency is illustrated in their respective diagrams. The way in which dielectric properties change with time is also discussed. Findings The goal of this paper is to give an overview of the characteristics of the dielectrics and how frequency affects the relative complex permittivity and to present different approaches to and equations for the relative complex permittivity, such as that of Debye, Cole–Cole, Cole–Davidson and Havriliak–Negami. In addition, three mechanisms of polarization, namely, electronic, atomic and bipolar, are presented. The most common dielectric characterization device, a capacitor with parallel plates between which the dielectric material under study is located, is also discussed. Ohmic and dielectric losses of a non-ideal capacitor are accounted for. Furthermore, this paper studies the equivalent circuits of a non-ideal parallel plate capacitor, those being a resistor and an ideal capacitor connected either in series or in parallel. Originality/value Finally, dielectric responses to both time and to stepwise excitation are given.

scholarly journals Experimental Study of Moment Method for Undergraduates in Electromagnetic

1970 ◽  
Vol 109 (3) ◽  
pp. 115-118 ◽  
Author(s):  
N. F. O. Serteller ◽  
A. G. Ak ◽  
G. Kocyigit ◽  
T. C. Akinci
Keyword(s):  
Experimental Study ◽  
Method Of Moments ◽  
Moment Method ◽  
Parallel Plate ◽  
Dielectric Materials ◽  
Space Theory ◽  
Complex Matrix ◽  
Education Students ◽  
Parallel Plate Capacitor ◽  
Linear Vector Space

The experimental study and Moment Method with is programmed in Mathematica are presented here to facilitate introductory instruction on numerical methods for undergraduate electrical education students. The Method of Moments (MOM) is introduced at the beginning level to prepare students for subsequent advanced topics in complex matrix method and linear vector space theory. The study is carried out with parallel plate capacitor. The different capacitor (dielectric) materials are tried and coincidental program of MOM are studied. Ill. 4, bibl. 9, tabl. 1 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.109.3.184

scholarly journals Toward an Improved Understanding of the Role of Dielectrics in Capacitors

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1519 ◽  
Author(s):  
Jonathan Phillips
Keyword(s):  
Dielectric Constant ◽  
Parallel Plate ◽  
Dielectric Material ◽  
Fundamental Principle ◽  
Implicit Assumption ◽  
Parallel Plate Capacitor ◽  
Plate Capacitor ◽  
Power Densities

A new fundamental principle of the theory of dielectrics in capacitors is demonstrated. That is, dielectric material in any geometry that reduces the field generated by charges on capacitor electrodes is effective in increasing capacitance. Specifically, it is shown that super dielectric material on the outer surfaces of the electrodes of a parallel plate capacitor increases dielectric constant, as well as energy and power densities, by orders of magnitude. The implicit assumption in all current capacitor theory, that the “capacitor” is only that region occupied by the electrodes and the space between them, is shown to be incorrect.

Enhanced performance of supercapacitors by constructing a “mini parallel-plate capacitor” in an electrode with high dielectric constant materials

2020 ◽  
Vol 8 (32) ◽  
pp. 16661-16668
Author(s):  
Huayao Tu ◽  
Shouzhi Wang ◽  
Hehe Jiang ◽  
Zhenyan Liang ◽  
Dong Shi ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Carbon Fiber ◽  
Parallel Plate ◽  
Sandwich Structure ◽  
High Dielectric Constant ◽  
Parallel Plate Capacitor ◽  
Plate Capacitor ◽  
Fiber Metal ◽  
High Dielectric ◽  
Mini Plate

The carbon fiber/metal oxide/metal oxynitride layer sandwich structure is constructed in the electrode to form a mini-plate capacitor. High dielectric constant metal oxides act as dielectric to increase their capacitance.

Mathematical model to predict the characteristics of polarization in dielectric materials: The concept of piezoelectrcity and electrostriction

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Mathematical Model ◽  
Electric Field ◽  
Lead Zirconate Titanate ◽  
Dielectric Material ◽  
Strain Curve ◽  
Dielectric Materials ◽  
Lead Zirconate ◽  
Simulation Software ◽  
Constitutive Law ◽  
Basic Material

Model was developed for the prediction of polarization characteristics in a dielectric material exhibiting piezoelectricity and electrostriction based on mathematical equations and MATLAB computer simulation software. The model was developed based on equations of polarization and piezoelectric constitutive law and the functional coefficient of Lead Zirconate Titanate (PZT) crystal material used was 2.3×10-6 m (thickness), the model further allows the input of basic material and calculation of parameters of applied voltage levels, applied stress, pressure, dielectric material properties and so on, to generate the polarization curve, strain curve and the expected deformation change in the material length charts. The mathematical model revealed that an application of 5 volts across the terminals of a 2.3×10-6 m thick dielectric material (PZT) predicted a 1.95×10-9 m change in length of the material, which indicates piezoelectric properties. Both polarization and electric field curve as well as strain and voltage curve were also generated and the result revealed a linear proportionality of the compared parameters, indicating a resultant increase in the electric field yields higher polarization of the dielectric materials atmosphere.

scholarly journals Na0.76V6O15/Activated Carbon Hybrid Cathode for High-Performance Lithium-Ion Capacitors

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 122
Author(s):  
Renwei Lu ◽  
Xiaolong Ren ◽  
Chong Wang ◽  
Changzhen Zhan ◽  
Ding Nan ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Energy Density ◽  
Power Density ◽  
Cathode Materials ◽  
Low Cost ◽  
Lithium Ion ◽  
High Energy ◽  
Cycling Stability ◽  
High Energy Density ◽  
Artificial Graphite

Lithium-ion hybrid capacitors (LICs) are regarded as one of the most promising next generation energy storage devices. Commercial activated carbon materials with low cost and excellent cycling stability are widely used as cathode materials for LICs, however, their low energy density remains a significant challenge for the practical applications of LICs. Herein, Na0.76V6O15 nanobelts (NaVO) were prepared and combined with commercial activated carbon YP50D to form hybrid cathode materials. Credit to the synergism of its capacitive effect and diffusion-controlled faradaic effect, NaVO/C hybrid cathode displays both superior cyclability and enhanced capacity. LICs were assembled with the as-prepared NaVO/C hybrid cathode and artificial graphite anode which was pre-lithiated. Furthermore, 10-NaVO/C//AG LIC delivers a high energy density of 118.9 Wh kg−1 at a power density of 220.6 W kg−1 and retains 43.7 Wh kg−1 even at a high power density of 21,793.0 W kg−1. The LIC can also maintain long-term cycling stability with capacitance retention of approximately 70% after 5000 cycles at 1 A g−1. Accordingly, hybrid cathodes composed of commercial activated carbon and a small amount of high energy battery-type materials are expected to be a candidate for low-cost advanced LICs with both high energy density and power density.

scholarly journals In Situ Fabrication of Activated Carbon from a Bio-Waste Desmostachya bipinnata for the Improved Supercapacitor Performance

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Gopal Krishna Gupta ◽  
Pinky Sagar ◽  
Sumit Kumar Pandey ◽  
Monika Srivastava ◽  
A. K. Singh ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Energy Density ◽  
Power Density ◽  
Supercapacitor Electrode ◽  
In Situ Fabrication ◽  
Transmission Electron ◽  
Good Energy ◽  
Supercapacitor Performance ◽  
Operating Potential

AbstractHerein, we demonstrate the fabrication of highly capacitive activated carbon (AC) using a bio-waste Kusha grass (Desmostachya bipinnata), by employing a chemical process followed by activation through KOH. The as-synthesized few-layered activated carbon has been confirmed through X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopy techniques. The chemical environment of the as-prepared sample has been accessed through FTIR and UV–visible spectroscopy. The surface area and porosity of the as-synthesized material have been accessed through the Brunauer–Emmett–Teller method. All the electrochemical measurements have been performed through cyclic voltammetry and galvanometric charging/discharging (GCD) method, but primarily, we focus on GCD due to the accuracy of the technique. Moreover, the as-synthesized AC material shows a maximum specific capacitance as 218 F g−1 in the potential window ranging from − 0.35 to + 0.45 V. Also, the AC exhibits an excellent energy density of ~ 19.3 Wh kg−1 and power density of ~ 277.92 W kg−1, respectively, in the same operating potential window. It has also shown very good capacitance retention capability even after 5000th cycles. The fabricated supercapacitor shows a good energy density and power density, respectively, and good retention in capacitance at remarkably higher charging/discharging rates with excellent cycling stability. Henceforth, bio-waste Kusha grass-derived activated carbon (DP-AC) shows good promise and can be applied in supercapacitor applications due to its outstanding electrochemical properties. Herein, we envision that our results illustrate a simple and innovative approach to synthesize a bio-waste Kusha grass-derived activated carbon (DP-AC) as an emerging supercapacitor electrode material and widen its practical application in electrochemical energy storage fields.

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