Dielectric Film Composition for High-Capacitance Stable Capacitors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing film capacitors face challenges in increasing capacitance without reducing the thickness of the dielectric membrane layer, which is difficult to process and prone to insulation breakdown, and polyurea-based dielectric materials risk metal corrosion due to amide bonds.
Innovation Solution
A dielectric composition comprising a polymer with a repeating unit of a heterocycle and carbonyl group is used, avoiding amide bonds to enhance permittivity and stability, allowing for high capacitance without thickness reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the dielectric membrane layer is reduced to increase capacitance, then the capacitance increases, but the processing difficulty increases and insulation breakdown occurs
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric material by introducing specific heterocyclic structures (morpholino, piperidino, or homopiperidino groups) into the polymer backbone. This compositional parameter change enables the dielectric layer to achieve higher permittivity (εr ≥ 3.5) at maintained thickness, thereby increasing capacitance without the need to reduce thickness, thus avoiding insulation breakdown issues
Solution Approach 2:
The patent creates a composite polymer structure by incorporating heterocyclic rings (containing N or O atoms) into the polymer backbone alongside carbonyl groups. This composite material approach combines the benefits of high permittivity from the heterocyclic-polar group combinations while maintaining the structural integrity and insulation properties of the polymer matrix
2Stress or pressure
If polyurea is used as a dielectric with high permittivity, then the permittivity increases, but metal corrosion occurs due to amine adsorption
Solution Approach 1:
The patent extracts and eliminates the amide bond structure (-CONH-) from the polymer backbone that is present in polyurea. By removing this specific structural component, the source of amine generation is eliminated, thereby preventing metal corrosion while retaining high permittivity through alternative heterocyclic structures
Solution Approach 2:
The patent converts the potential harm of amine generation into a benefit by replacing the amide bond with heterocyclic structures containing N or O atoms. These alternative structures provide similar or enhanced permittivity without the harmful side effect of amine release, thus transforming a harmful chemical pathway into a beneficial one
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 high permittivity and reduced insulation breakdown risk, suitable for in-vehicle capacitors with increased capacitance and stability.
Implementation Method 1
the dielectric composition includes no amide bond and has a high permittivity
Data Source
AI summary
A dielectric composition includes a polymer having a repeating structure of a unit structure including at least one heterocycle and at least one carbonyl group. The unit structure preferably includes at least one chemical structure including the at least one heterocycle and the at least one carbonyl group bonded to the at least one heterocycle.