Nitrogen-Containing Polymer Composite Electrolyte for Capacitor Film Quality
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Solution Overview
Problem
Conductive polymer solid electrolytic capacitors face issues with low yield and high impedance, especially for high voltage applications, due to poor film properties and brittleness, leading to reduced reliability and increased leakage current at high temperatures and loads.
Innovation Solution
A solid electrolyte mixture comprising a conductive polymer and a nitrogen-containing polymer, such as polyvinylpyrrolidone, is used in the synthesis of conductive polymer solid electrolytic capacitors, improving film forming properties and conductivity by adjusting the weight ratios and molecular weights of the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive polymer is used as solid electrolyte to eliminate liquid electrolyte disadvantages, then temperature properties and long-term stability are improved, but leakage current increases under high load or high temperature
Solution Approach 1:
The patent combines conductive polymer with nitrogen-containing polymer to form a composite solid electrolyte. This composite structure leverages the high conductivity of conductive polymer while the nitrogen-containing polymer provides structural stability and reduced leakage current, resolving the contradiction between reliability and harmful leakage current.
2Productivity
If monomer and oxidant are reacted quickly to form conductive polymer, then polymerization efficiency is improved, but uniform coverage of electrode is not achieved
Solution Approach 1:
The patent introduces an inhibitor as an intermediary substance that temporarily controls the reaction between monomer and oxidant. This inhibitor moderates the polymerization rate, allowing uniform distribution of reactants across the electrode surface while still achieving efficient polymer formation, thus resolving the contradiction between productivity and manufacturing precision.
3Manufacturing precision
If inhibiting agent is added to reduce reaction rate and improve solid electrolytic capacitor properties, then film quality is improved, but withstanding voltage cannot be effectively increased for high voltage applications
Solution Approach 1:
The patent changes the chemical composition parameters by introducing nitrogen-containing polymers with specific functional groups. These parameter changes enable the film to achieve both high quality (through controlled polymerization) and high withstanding voltage (through enhanced dielectric properties of the nitrogen-containing polymer), resolving the contradiction between manufacturing precision and strength.
4Reliability
If conductive polymer is made highly conductive to reduce ESR, then high-frequency low impedance is achieved, but film brittleness increases causing deformation and breakdown
Solution Approach 1:
The patent creates a composite material where conductive polymer provides high conductivity for low ESR, while nitrogen-containing polymer provides mechanical strength and flexibility. This composite structure resolves the contradiction between reliability (high-frequency performance) and strength (film mechanical integrity).
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 addition of nitrogen-containing polymers enhances the film forming properties and conductivity of the conductive polymer, increasing the capacitance, reliability, and withstanding voltage of solid electrolytic capacitors while reducing the dissipation factor and equivalent series resistance.
Implementation Method 1
A solid electrolyte mixture includes a conductive polymer and a nitrogen-containing polymer... The addition of nitrogen-containing polymers enhances the film forming properties and conductivity of the conductive polymer
Data Source
AI summary
An electrolyte mixture for electrolytic capacitor is disclosed. The electrolyte mixture includes a conductive polymer and a nitrogen-containing polymer. The nitrogen-containing polymer includes a cyclic nitrogen-containing polymer, a polymer with primary amine group, a polymer with secondary amine group, a polymer with tertiary amine group, a polymer with quaternary ammonium group, or a combination thereof.