Solid Electrolytic Capacitor Amine Interlayer Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing solid electrolytic capacitors face issues with non-uniform conductive polymer layer thickness and poor adhesive properties between layers, leading to potential separation under thermal or mechanical stress, which increases the equivalent series resistance (ESR) and leakage current failures.
Innovation Solution
A method involving the formation of a first solid electrolyte layer followed by an amine compound layer and a second solid electrolyte layer, where the amine compound layer enhances the adhesive properties by electrostatic attraction between the positively-charged amine compound and negatively-charged conductive polymer layers, ensuring a uniform thickness and improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive polymer layer is formed by chemical oxidation polymerization, then the layer can be formed on the dielectric oxide film, but the adhesive property between layers becomes poor and they separate under thermal or mechanical stress
Solution Approach 1:
The patent introduces an amine compound layer as an intermediary between the first conductive polymer layer and the second conductive polymer layer. This intermediate layer acts as a bonding promoter that chemically bonds to both adjacent layers, creating a strong adhesive interface that prevents separation under thermal or mechanical stress.
Solution Approach 2:
The patent creates a composite structure by combining multiple materials (conductive polymers and amine compounds) in a layered configuration. This composite approach leverages the complementary properties of each material to achieve superior overall performance, particularly in terms of interlayer adhesion and stress resistance.
2Manufacturing precision
If a conductive polymer solution is applied and dried to form a layer, then the thickness can be controlled, but the central portion becomes thicker while the peripheral portion becomes thinner due to surface tension and wettability effects
Solution Approach 1:
The amine compound layer serves as an intermediary that improves the wettability and adhesion of the conductive polymer solution to the substrate. By applying the amine compound layer first, the subsequent conductive polymer solution achieves more uniform spreading and thickness distribution across the entire surface, eliminating the thick-center/thin-periphery defect.
3Reliability
If multiple layers are formed to improve adhesive properties, then the reliability increases, but the manufacturing process becomes more complex
Solution Approach 1:
The patent segments the solid electrolyte into multiple functional layers (first conductive polymer layer, amine compound layer, second conductive polymer layer), where each layer performs a specific function. This segmentation allows optimization of each layer's properties while maintaining overall simplicity through the use of straightforward deposition techniques for each layer.
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 a solid electrolytic capacitor with enhanced tolerance to heat and stress, reducing leakage current failures and ESR degradation, thereby improving the overall reliability and performance.
Implementation Method 1
the amine compound layer enhances the adhesive properties by electrostatic attraction between the positively-charged amine compound and negatively-charged conductive polymer layers
Implementation Method 2
forming a second solid electrolyte layer by applying and drying a conductive polymer solution
Implementation Method 3
a dielectric oxide film is formed on a porous body made of a valve metal such as tantalum and aluminum by an anodic oxidation method
Implementation Method 4
The formation method of the conductive polymer layer, which is used as the solid electrolyte layer of such a solid electrolytic capacitor, is broadly divided into two methods, i.e., a chemical oxidation polymerization method
Data Source
AI summary
A solid electrolytic capacitor according to an aspect of the present invention includes an anode conductor including a porous valve metal body, a dielectric layer formed on a surface of the anode conductor, and a solid electrolyte layer including a conductive polymer layer formed on a surface of the dielectric layer, in which the solid electrolyte layer includes a first solid electrolyte layer formed on a surface of the dielectric layer, and a second solid electrolyte layer formed on a surface of the first solid electrolyte layer, and at least one continuous or discontinuous layer containing an amine compound exists between the first and second solid electrolyte layers, and inside the second solid electrolyte layer.