Solid Electrolytic Capacitor Silane Intermediate Layer ESR Reduction
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Solution Overview
Problem
Conventional solid electrolytic capacitors fail to achieve sufficiently low equivalent serial resistance (ESR) in high frequency regions due to inadequate contact resistance reduction between the dielectric layer and the cathode.
Innovation Solution
Incorporating an intermediate layer of organic silane, such as aminopropyltriethoxysilane (APTES), dimethoxydiphenylsilane (DMDPS), or mercaptopropyltrimethoxysilane (MPTMS), between the electrolyte layer and the first conductive layer to enhance adhesion properties and reduce contact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the intermediate layer thickness is increased to improve adhesion, then adhesion property is improved, but resistance between electrolyte layer and cathode increases
Solution Approach 1:
The thickness of the intermediate layer is precisely controlled within the range of 0.1 nm to 2.0 nm. This parameter optimization ensures sufficient adhesion between the electrolyte layer and the first conductive layer while maintaining low resistance, preventing the trade-off between adhesion strength and electrical resistance.
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 use of an organic silane intermediate layer improves adhesion and reduces contact resistance, resulting in a solid electrolytic capacitor with lower ESR in high frequency regions without increasing resistance, with optimal thickness ranging from 0.1 nm to 2.0 nm.
Implementation Method 1
organic silane has a good adhesion property to manganese oxide, conductive polymer and carbon
Data Source
AI summary
In this solid electrolytic capacitor, a plate-shaped anode having a porous sintered body, a dielectric layer and an electrolyte layer of polypyrrole are formed in this order for covering one part of an anode lead. An intermediate layer of aminopropyltriethoxysilane (APTES) is formed for covering the electrolyte layer. A cathode having a first conductive layer containing graphite particles and a second conductive layer containing silver particles is formed for covering the intermediate layer. The cathode and a cathode terminal are connected by a conductive adhesive layer. The anode lead and the anode terminal are connected by welding. Further, a mold outer resin is formed to allow one end of the cathode terminal and one end of the anode terminal to project therefrom.