Conductive Polymer Electrolyte for Heat-Resistant Capacitors
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Solution Overview
Problem
Electrolytic capacitors face challenges in high-temperature environments due to increased heat generation, leading to oxidative deterioration and dedoping of the conductive polymer component, which results in higher ESR and leakage current.
Innovation Solution
The electrolytic capacitor incorporates a liquid component containing a first solvent, such as polyol or its derivative, and a base component with a conjugate acid pKa between 5 and 10 and a boiling point of 100°C or higher, along with an acid component, to suppress volatilization and dedoping, maintaining excellent layer repair performance and reducing ESR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ripple current is increased to increase capacitance and reduce size, then the heat generation increases and the temperature rises, but the heat resistance deteriorates due to oxidative deterioration and dedoping
Solution Approach 1:
The patent changes the chemical parameters of the liquid electrolyte by specifying a base component with a conjugate acid pKa of 5 or more and a boiling point of 100°C or higher. This parameter change suppresses the oxidative deterioration and dedoping of the conductive polymer even at elevated temperatures, thereby maintaining heat resistance while allowing increased ripple current capability
Solution Approach 2:
The patent creates a composite electrolyte system combining a non-aqueous solvent with a specifically selected base component (having conjugate acid pKa ≥5 and boiling point ≥100°C). This composite material provides both the ionic conductivity needed for high capacitance density and the thermal stability required for high heat resistance
2Ease of operation
If conventional liquid electrolytes are used, then the capacitor can operate, but the base component volatilizes at high temperatures causing dedoping and increased ESR
Solution Approach 1:
The patent applies parameter changes by selecting a base component with a boiling point of 100°C or higher. This physical parameter change prevents volatilization at operating temperatures, eliminating dedoping and maintaining low ESR while preserving full electrolyte functionality
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
This configuration enhances the electrolytic capacitor's heat resistance by suppressing oxidative deterioration and dedoping, thereby maintaining low ESR and leakage current even in high-temperature conditions.
Implementation Method 1
the liquid component contains a first solvent, a base component, and an acid component... the first solvent is at least one selected from the group consisting of a polyol and a derivative thereof
Implementation Method 2
the base component contains a first base a conjugate acid of which has an acid dissociation constant of 5 or more and 10 or less... suppressing oxidative deterioration and dedoping
Data Source
AI summary
An electrolytic capacitor including a capacitor element, and a liquid component. The capacitor element includes an anode body having a dielectric layer at a surface of the anode body, and a conductive polymer component covering part of the dielectric layer. The liquid component contains a first solvent, a base component, and an acid component. The first solvent is at least one selected from the group consisting of a polyol and a derivative thereof. The base component contains a first base a conjugate acid of which has an acid dissociation constant of 5 or more and 10 or less and which has no boiling point or a boiling point of 100° C. or higher.