Related Experiment Video
Updated: Aug 2, 2025
06:34
Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
5.9K
Composition-Driven Polarization Distribution in Poly(vinylidene fluoride)-Based Copolymer Blends for High Power
Lianliang Xiao1,2,3, Zhigang Liu3, Xindi Sun2
1Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, Xiangtan University, Xiangtan 411105, China.
ACS Applied Materials & Interfaces
|April 18, 2023
Summary
Researchers developed advanced polymer blends for high-performance capacitors. These new materials achieve exceptional energy and power density, overcoming traditional limitations in dielectric materials for electronics and pulsed power systems.
Area of Science:
- Materials Science
- Polymer Chemistry
- Electrical Engineering
Background:
- High power density capacitors are crucial for modern electronics and pulsed power systems.
- A key challenge is the inverse relationship between breakdown strength and permittivity in dielectric materials.
- Developing novel dielectric materials is essential for enhancing capacitor performance.
Purpose of the Study:
- To create high-performance dielectric materials for capacitors by blending PVDF-TrFE and PVDF-HFP.
- To investigate the impact of composition-driven microstructures on energy storage capabilities.
- To understand the microscopic mechanisms behind enhanced energy storage in these polymer blends.
Main Methods:
- Synthesis of poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) copolymer blends.
- Characterization of composition-driven 0-3 type microstructures and crystalline phase evolution (γ- to α-phase).
- Finite element analysis to correlate microstructures, composition, local electric field, and polarization.
Main Results:
- PVDF-based copolymer blends exhibited composition-driven 0-3 type microstructures with dispersed PVDF-TrFE nanospheres.
- Maximum energy storage performance achieved at a critical TrFE/HFP mole ratio of 1, with a discharged energy density (Udis) of ~24.3 J/cm³ at 607 MV/m.
- Blend films delivered ultrahigh energy density (20.4 J/cm³) and power density (7.29 MW/cm³) in a practical charge/discharge circuit.
Conclusions:
- The developed PVDF-based copolymer blends offer a promising strategy for high-performance dielectric materials.
- The study demonstrates a method to overcome the inverse relationship between breakdown strength and permittivity.
- These materials significantly outperform existing polymer-based composites and copolymer films in energy and power densities for advanced capacitors.
More Related Videos
08:59Synthesizing a Gel Polymer Electrolyte for Supercapacitors, Assembling a Supercapacitor Using a Coin Cell, and Measuring Gel Electrolyte Performance
Published on: November 30, 2022
4.5K
05:33Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
21.8K
Related Concept Videos
01:31Dielectric Polarization in a Capacitor
4.8K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.8K
01:29Potential Due to a Polarized Object
443
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
443
01:18Capacitor With A Dielectric
4.0K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
4.0K
01:26Spherical and Cylindrical Capacitor
5.8K
A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
Conventionally, considering the symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field,...
Conventionally, considering the symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field,...
5.8K
01:26Susceptibility, Permittivity and Dielectric Constant
1.7K
When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
1.7K
01:25MOS Capacitor
880
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
880