Electrolytic Capacitor Solid Electrolyte Layer Adhesion
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Solution Overview
Problem
Conventional electrolytic capacitors with a solid electrolyte layer and electrolyte solution fail to achieve both high electrostatic capacity and low Equivalent Series Resistance (ESR) when a titanium coating film is formed on the cathode foil.
Innovation Solution
The electrolytic capacitor design includes a cathode foil with a covering layer containing titanium or nickel, a solid electrolyte layer made from a conductive polymer, polymer dopant, and base component, and an electrolyte solution, where the solid electrolyte layer is formed by impregnating a capacitor element with a dispersion and then removing the solvent, enhancing adhesiveness and covering properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a titanium coating film is formed on the cathode foil, then the capacitor structure is stabilized, but the electrostatic capacity is insufficient and ESR is high
Solution Approach 1:
The invention uses a composite solid electrolyte layer comprising a conductive polymer matrix combined with metal particles (aluminum, zinc, or calcium) dispersed within it. This composite structure provides both the structural stability needed for capacitor operation and the enhanced electrostatic capacity through the metal particles' high conductivity and surface area, while maintaining low ESR values.
Solution Approach 2:
The invention changes the physical and chemical parameters of the electrolyte system by transitioning from conventional liquid electrolytes to a solid electrolyte layer with controlled composition. By adjusting the conductive polymer type, metal particle size and concentration, and layer thickness, the capacitor achieves optimized electrostatic capacity and ESR performance while maintaining structural integrity.
2Ease of manufacture
If a solid electrolyte layer is formed by conventional methods, then the manufacturing process is simple, but the adhesiveness and covering properties are insufficient
Solution Approach 1:
The solid electrolyte layer is formed with a porous or semi-porous structure that enhances adhesion to the cathode foil. The porous structure increases the surface area for bonding while allowing the conductive polymer and metal particles to distribute uniformly, improving both adhesiveness and covering properties without complicating the manufacturing process.
Solution Approach 2:
The conductive polymer acts as an intermediary matrix that bonds the metal particles to the cathode foil. This polymer matrix provides adhesive properties that secure the metal particles in place while maintaining electrical conductivity, thereby improving both adhesiveness and covering properties through the mediating role of the polymer material.
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 configuration results in an electrolytic capacitor with high electrostatic capacity and low ESR, improving the capacitor's electrostatic performance.
Implementation Method 1
the solid electrolyte layer contains a conductive polymer, a polymer dopant, and a base component
Implementation Method 2
the capacitor element is impregnated with the electrolyte solution
Data Source
AI summary
An electrolytic capacitor includes a capacitor element, a solid electrolyte layer, an electrolyte solution. The capacitor element has an anode foil with a dielectric layer, and a cathode foil. The solid electrolyte layer is provided between the anode foil and the cathode foil. And the capacitor element is impregnated with the electrolyte solution. The cathode foil includes a covering layer that contains at least one metal selected from titanium and nickel or a compound of the at least one metal. And the solid electrolyte layer contains a conductive polymer, a polymer dopant, and a base component.