Solid Electrolytic Capacitor Silicone Oil Water-Repellent Coating
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Solution Overview
Problem
Conventional solid electrolytic capacitors with conductive polymer layers face challenges in completely covering the anode element's surface, leading to exposure of dielectric films and increased capacity variability due to moisture absorption in humid environments, reducing reliability.
Innovation Solution
A solid electrolytic capacitor design featuring a dielectric film covered with a conductive polymer layer and a water-repellent portion containing silicone oil on the dielectric film not in contact with the conductive polymer layer, which prevents moisture contact and stabilizes capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive polymer layer is formed on a dielectric film by electrolytic polymerization, then the capacitor achieves high capacity and small size, but the conductive polymer layer cannot completely cover the dielectric film surface, causing exposure and capacity instability in humid environments
Solution Approach 1:
The patent applies local quality by creating a water-repellent coating specifically on the exposed dielectric film portions where conductive polymer did not cover. This selective treatment addresses the coverage deficiency locally without requiring complete reformulation of the polymerization process, maintaining the original electrolytic polymerization benefits while protecting vulnerable areas.
Solution Approach 2:
The patent uses composite materials by combining the conductive polymer layer with a water-repellent coating containing fluorocarbon resin and silicone oil. This composite structure provides both the electrical functionality of the conductive polymer and the moisture protection of the water-repellent coating, solving the coverage and stability issues simultaneously.
2Reliability
If the dielectric film is completely exposed to moisture in humid environments, then moisture permeates and contacts the dielectric film directly, but this causes capacity increase and reliability degradation
Solution Approach 1:
The patent converts the harmful effect of moisture by introducing a water-repellent coating that actively prevents moisture contact. The coating containing fluorocarbon resin and silicone oil creates a hydrophobic barrier, transforming the vulnerable exposed dielectric surface into a protected interface that repels moisture rather than absorbing it.
Solution Approach 2:
The water-repellent coating acts as an intermediary layer between the dielectric film and the external humid environment. This intermediate barrier prevents direct contact between moisture and the dielectric film, eliminating the harmful interaction while allowing the capacitor to function normally in humid conditions.
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 integration of a silicone oil-based water-repellent portion effectively suppresses moisture contact with the dielectric film, enhancing the reliability and stability of the capacitor's capacity by preventing capacity fluctuations due to humidity.
Implementation Method 1
forming a dielectric film composed of tantalum oxide on a surface of a sintered body by anodizing the surface of the sintered body of tantalum
Implementation Method 2
forming a conductive polymer layer on the dielectric film
Implementation Method 3
a water-repellent portion which is provided on the dielectric film not in contact with the conductive polymer layer and contains silicone oil
Data Source
AI summary
A solid electrolytic capacitor having an anode element, a dielectric film covering a surface of the anode element, a conductive polymer layer provided on the dielectric film, and a water-repellent portion provided on the dielectric film not in contact with the conductive polymer layer and containing silicone oil is provided.