Electrolytic Capacitor Sulfuric Acid Concentration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrolytic capacitors with solid electrolyte layers experience a dedoping phenomenon, leading to increased Equivalent Series Resistance (ESR) over time due to the degradation of π-conjugated conductive polymers, which is not effectively addressed by existing technologies, especially at high temperatures.
Innovation Solution
Incorporating sulfuric acid at specific concentrations (2.9 ppm to 532 ppm) in the electrolytic solution, along with organic sulfonic acid as a dopant in the solid electrolyte layer, to inhibit dedoping and maintain low ESR while preventing electrode corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an acid component is included in the electrolytic solution to suppress the dedoping phenomenon, then the stability of the conductive polymer is improved, but electrode corrosion occurs
Solution Approach 1:
The patent applies parameter changes by precisely controlling the concentration of sulfuric acid in the electrolytic solution within the range of 2.9 ppm to 532 ppm. This specific concentration range optimizes the balance between suppressing dedoping of the conductive polymer and preventing electrode corrosion, resolving the technical contradiction through quantitative parameter optimization.
Solution Approach 2:
The patent introduces an organic sulfonic acid as an intermediary substance in the solid electrolyte layer that mediates between the conductive polymer and the acidic electrolytic solution. This intermediary helps stabilize the conductive polymer against dedoping while the controlled sulfuric acid concentration in the electrolytic solution prevents excessive corrosion, thus resolving the contradiction through the use of mediating substances.
2Reliability
If the concentration of sulfuric acid is increased to improve conductivity, then ESR is reduced, but electrode corrosion increases
Solution Approach 1:
The patent resolves this contradiction by establishing an optimal concentration range for sulfuric acid (2.9 ppm to 532 ppm) in the electrolytic solution. Within this range, the conductivity is sufficiently improved to maintain low ESR, while the concentration remains low enough to prevent excessive electrode corrosion, achieving the balance through precise parameter control.
3Object-affected harmful factors
If weak acidity is used to prevent electrode corrosion, then corrosion is reduced, but the conductive polymer degrades at high temperatures
Solution Approach 1:
The patent uses organic sulfonic acid as an intermediary in the solid electrolyte layer that provides stabilization to the conductive polymer, particularly at high temperatures. This intermediary substance allows the system to use a more acidic electrolytic solution (with sulfuric acid) for better conductivity without suffering from severe polymer degradation, thus resolving the contradiction through mediating protection.
Solution Approach 2:
The patent employs a composite structure combining the conductive polymer with organic sulfonic acid in the solid electrolyte layer. This composite material provides enhanced thermal stability and protection against dedoping, allowing the capacitor to withstand high temperatures while maintaining low ESR through the acidic electrolytic solution, thus resolving the contradiction through material composition optimization.
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 effectively maintains low ESR and prevents electrode corrosion, ensuring the stability and performance of electrolytic capacitors, even under severe temperature conditions, by optimizing the conductivity of the conductive polymer and controlling the acidity level.
Implementation Method 1
It is known that the dopant gradually comes out into the electrolytic solution, which is called as a dedoping phenomenon. Thus, the conductive polymer degrades with time, thereby gradually increasing the ESR of the electrolytic capacitor.
Implementation Method 2
The solid electrolyte layer includes a π-conjugated conductive polymer and an organic sulfonic acid
Implementation Method 3
The acid component in the electrolytic solution inhibits the phenomenon of dedoping from a conductive polymer, and at the same time, has an action of corroding an electrode of an electrolytic capacitor.
Data Source
AI summary
An electrolytic capacitor includes an anode body with a dielectric layer; a solid electrolyte layer; and an electrolytic solution. The solid electrolyte layer includes a π-conjugated conductive polymer and an organic sulfonic acid. The electrolytic solution includes a solvent and an acid component, and the acid component includes a sulfuric acid. A concentration of the sulfuric acid in the electrolytic solution ranges from 2.9 ppm to 532 ppm, inclusive.