Electrolytic Capacitor Solid Electrolyte Layer Moisture Resistance
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Solution Overview
Problem
Existing electrolytic capacitors lack improved heat resistance and moisture resistance properties, which are essential for long-term performance in high humidity and high-temperature environments.
Innovation Solution
A method for manufacturing electrolytic capacitors involving the formation of a solid electrolyte layer using a first conductive polymer layer treated with a liquid containing a compound with a naphthalene or anthraquinone skeleton and SO3-containing groups, followed by a second conductive polymer layer, enhancing adhesion and reducing interface resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte layer formation methods are used, then the capacitor can be manufactured with basic performance, but the heat resistance and moisture resistance properties are insufficient
Solution Approach 1:
The solid electrolyte layer is divided into multiple distinct layers: a first conductive polymer layer, an intermediate layer containing the naphthalene or anthraquinone derivative with SO3-containing groups, and a second conductive polymer layer. This segmentation allows each layer to perform specific functions, with the intermediate layer providing enhanced adhesion and interface resistance properties, thereby improving overall reliability without excessive complexity.
Solution Approach 2:
The invention uses a composite structure combining different conductive polymers with a specific intermediate compound layer. The intermediate layer contains compounds with naphthalene or anthraquinone skeletons and SO3-containing groups, which create a composite material system that exhibits superior heat resistance and moisture resistance compared to conventional single-layer structures.
2Reliability
If a single-layer conductive polymer structure is used, then the manufacturing process is simple, but the adhesion and interface resistance properties are insufficient
Solution Approach 1:
The intermediate layer containing the naphthalene or anthraquinone derivative with SO3-containing groups is applied as a preliminary treatment between the conductive polymer layers. This preliminary action enhances the adhesion and interface resistance properties of the subsequent conductive polymer layer, ensuring better bonding without requiring complex post-processing steps.
Solution Approach 2:
The intermediate layer acts as a mediator between the conductive polymer layers, providing improved adhesion and interface resistance. The compound with naphthalene or anthraquinone skeleton and SO3-containing groups serves as a chemical intermediary that enhances interfacial bonding, thereby improving reliability while maintaining manufacturing feasibility.
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 approach results in electrolytic capacitors with superior moisture resistance and heat resistance properties, as demonstrated by reduced ESR and capacitance retention under testing conditions.
Implementation Method 1
applying a first treatment liquid to the first conductive polymer layer... enhancing adhesion and reducing interface resistance
Data Source
AI summary
A method for manufacturing an electrolytic capacitor includes: preparing an anode body that includes a dielectric layer, and forming a solid electrolyte layer on the dielectric layer. The forming of the solid electrolyte layer includes: forming a first conductive polymer layer on the dielectric layer, applying a first treatment liquid to the first conductive polymer layer, and forming a second conductive polymer layer after the applying of the first treatment liquid. The first conductive polymer layer includes a first conductive polymer. The first treatment liquid contains a first compound and a solvent. The first compound has a skeleton of naphthalene or anthraquinone, and includes at least one SO3-containing group bonded to the skeleton. The at least one SO3-containing group is at least one selected from a group consisting of a sulfonic acid group and a sulfonate group.