Solid Electrolyte Capacitor Moisture Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conductive polymer-based electrolytic capacitors face issues with reduced electrostatic capacity and increased equivalent series resistance (ESR) due to moisture reaction, and existing solutions using polyhydric alcohols and oxoacids fail to adequately improve performance.
Innovation Solution
A method involving the formation of a solid electrolyte layer with a conductive polymer and a polyhydric alcohol, followed by impregnation with an oxoacid or vice versa, to enhance adhesion and reduce ESR while maintaining electrostatic capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conductive polymer is used as a solid electrolyte layer, then electrostatic capacity can be increased, but the polymer reacts with moisture to decrease electric conductivity, causing increased ESR
Solution Approach 1:
A polyhydric alcohol is introduced as an intermediary substance between the conductive polymer and moisture. The polyhydric alcohol forms hydrogen bonds with water molecules, preventing direct contact between moisture and the conductive polymer, thereby maintaining electric conductivity while preserving the high electrostatic capacity benefits of the conductive polymer
Solution Approach 2:
The chemical composition of the solid electrolyte layer is modified by incorporating polyhydric alcohol alongside the conductive polymer. This parameter change in composition creates a composite structure where the polyhydric alcohol concentration is optimized to provide sufficient moisture barrier properties while maintaining the conductive characteristics needed for low ESR
2Reliability
If polyhydric alcohol and oxoacid are added to conductive polymer solution, then moisture resistance is improved, but ESR reduction and electrostatic capacity improvement are insufficient
Solution Approach 1:
The concentration ratio of polyhydric alcohol to oxoacid is optimized to achieve the desired balance. By carefully controlling these compositional parameters, the solid electrolyte layer achieves both sufficient moisture resistance and the required electrostatic capacity and ESR characteristics
Solution Approach 2:
A composite solid electrolyte layer is formed by combining conductive polymer, polyhydric alcohol, and oxoacid in specific proportions. This composite structure leverages the moisture-resistant properties of polyhydric alcohol and oxoacid while maintaining the high conductivity and capacitance of the conductive polymer base material
3Reliability
If conventional electrolyte solution with polyhydric alcohol and boric acid is used, then self-restoration performance is enhanced, but ESR and electrostatic capacity cannot be sufficiently improved
Solution Approach 1:
The invention extracts and applies the moisture-absorbing function of polyhydric alcohol specifically to the solid electrolyte layer formation process, separating this function from the conventional electrolyte solution approach. This allows the solid electrolyte layer itself to provide moisture protection, enabling better ESR and capacitance performance while maintaining self-restoration capabilities
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
This approach results in improved electrostatic capacity and reduced ESR, along with enhanced withstand voltage and self-restoration performance by forming a uniform solid electrolyte layer and optimizing the pH within the electrolyte.
Implementation Method 1
impregnating the anode body on which the solid electrolyte layer is formed, with a first treatment liquid that contains an oxoacid having two or more hydroxy groups
Data Source
AI summary
A method for producing an electrolytic capacitor is performed in the following procedure. A solid electrolyte layer including a conductive polymer and a polyhydric alcohol is formed on an anode body on which a dielectric layer is formed. Then, the anode body on which the solid electrolyte layer is formed is impregnated with a first treatment liquid that contains an oxoacid having two or more hydroxy groups.