Solid Electrolyte Capacitor Dual Silane Coupling Layers
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Solution Overview
Problem
The adhesion between the dielectric layer and the conductive polymer layer in solid electrolytic capacitors is not strong enough, leading to a decline in capacitance over time.
Innovation Solution
A solid electrolytic capacitor design that includes a positive electrode, a dielectric layer, a silane coupling layer, a conductive polymer layer, and a negative electrode layer, where a first and second silane coupling layer are used to enhance the adhesion between the dielectric and conductive polymer layers by covering exposed portions, improving the coverage ratio and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single silane coupling layer is formed on the dielectric layer, then adhesion between the dielectric layer and conductive polymer layer is improved, but the coverage ratio is insufficient and adhesion is not strong enough
Solution Approach 1:
The silane coupling layer is divided into multiple layers (first silane coupling layer and second silane coupling layer) formed at different stages. The first layer is formed before the conductive polymer layer, and the second layer is formed after to cover exposed portions, ensuring complete coverage and strong adhesion through segmented application
Solution Approach 2:
The first silane coupling layer is formed in advance on the dielectric layer before the conductive polymer layer is applied. This preliminary action prepares the surface with adhesion-promoting properties, ensuring that the conductive polymer layer will adhere strongly to the dielectric layer
2Reliability
If the conductive polymer layer is applied directly to the dielectric layer, then the manufacturing process is simple, but adhesion is insufficient and capacitance declines over time
Solution Approach 1:
The silane coupling layer acts as an intermediary between the dielectric layer and the conductive polymer layer. This intermediate layer chemically bonds to both surfaces, providing strong adhesion and preventing capacitance decline, while the two-stage formation process ensures complete coverage
Solution Approach 2:
The formation process parameters are changed by conducting two separate formation steps at different stages. The first formation step creates initial adhesion, and the second formation step after conductive polymer application ensures complete coverage of exposed portions, optimizing both adhesion strength and coverage ratio
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 enhanced adhesion and coverage ratio prevent a decline in capacitance over long-term use and improve voltage endurance characteristics.
Implementation Method 1
The silane coupling layer is provided on the dielectric layer... adhesion between a dielectric layer and a conductive polymer layer is high
Data Source
AI summary
A solid electrolytic capacitor comprises a positive electrode, a dielectric layer, a silane coupling layer, a conductive polymer layer, and a negative electrode layer. The dielectric layer is provided on the positive electrode. The silane coupling layer is provided on the dielectric layer. The conductive polymer layer is provided on the silane coupling layer. The negative electrode layer is provided on the conductive polymer layer. The silane coupling layer comprises a first silane coupling layer and a second silane coupling layer. The first silane coupling layer covers a part of a surface of the dielectric layer facing the conductive polymer layer. The second silane coupling layer covers at least a part of a portion exposed from the first silane coupling layer on the surface of the dielectric layer facing the conductive polymer layer.