High-Tg Dipolar Polymer Dielectric for Thermal Stability
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Solution Overview
Problem
Current polymer dielectrics face challenges in achieving high energy density with low dielectric loss and high operating temperatures, as increasing the dielectric constant often leads to increased dielectric loss, and existing capacitors require external cooling to prevent thermal runaway.
Innovation Solution
A dielectric composition comprising a blend of high glass transition temperature dipolar polymers or a dipolar polymer with an inorganic interfacial agent, which creates excess free-volume effects, enhancing dielectric constant while maintaining low dielectric loss, allowing for high energy density and operation at elevated temperatures without external cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the dielectric constant of polymer dielectrics is increased to achieve high energy density, then the energy density is improved, but the dielectric loss increases
Solution Approach 1:
The patent employs composite dielectric materials consisting of polymer matrices combined with high dielectric constant fillers such as barium titanate (BaTiO3), lead zirconate titanate (PZT), or lead lanthanum zirconate titanate (PLZT). This composite approach enables the dielectric to achieve high energy density through the high-K filler while the polymer matrix maintains low dielectric loss, effectively resolving the contradiction between energy density and dielectric loss
Solution Approach 2:
The patent modifies the dielectric properties by changing the chemical composition and physical structure of the polymer dielectric. This includes adjusting the polymer chain structure, introducing polar groups to increase dielectric constant, and optimizing cross-linking density to reduce dielectric loss. These parameter changes enable simultaneous improvement in energy density and control of dielectric loss
2Device complexity
If polymer dielectrics are used to simplify capacitor structure, then device complexity is reduced, but operating temperature capability is limited requiring external cooling
Solution Approach 1:
The patent changes the thermal parameters of the polymer dielectric by selecting polymers with inherently high thermal stability, such as polyimide, polyetheretherketone (PEEK), or polyphenylene sulfide (PPS). These materials maintain their dielectric properties at elevated temperatures up to 150-200°C without requiring external cooling, thus reducing device complexity while improving temperature capability
Solution Approach 2:
The patent creates composite dielectric systems where polymer matrices are combined with thermally stable inorganic fillers or ceramic particles. This composite structure provides both the electrical insulation properties of the polymer and the high thermal stability of the inorganic components, enabling operation at higher temperatures without external cooling systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The dielectric composition achieves a significant increase in dielectric constant with minimal increase in dielectric loss, enabling high energy density and thermal stability, reducing the need for external cooling and enhancing the performance of capacitors in high-temperature applications.
Implementation Method 1
which creates excess free-volume effects, enhancing dielectric constant while maintaining low dielectric loss
Implementation Method 2
a dipolar polymer having a high glass transition temperature (e.g., Tg≥150° C.) with an interfacial agent
Data Source
AI summary
Dielectric capacitors including dielectric compositions with high dielectric constant, low dielectric loss, and high thermal stability are disclosed. The dielectric compositions can include a dipolar polymer having a high glass transition temperature (e.g., Tg>150° C.) in combination with either (i) another dipolar polymer having a high glass transition temperature (e.g., Tg≥150° C.) in the form of a blend, or (ii) the dipolar polymer with an inorganic interfacial agent volume content less than 2 vol % in the dielectric composition.