Capacitor Solid Electrolyte Layer Conductivity and Strength
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Solution Overview
Problem
Conventional capacitors with solid electrolyte layers containing π conjugated conductive polymers face challenges in achieving both low equivalent series resistance (ESR) and high electric strength, while also being difficult to downsize and maintain electrostatic capacity.
Innovation Solution
A capacitor design incorporating a dielectric layer formed on a porous valve metal anode, with a solid electrolyte layer containing a π conjugated conductive polymer, a polyanion, and an ion-conductive compound, along with a compound having a sulfonic group and a water-soluble compound, to enhance conductivity and electric strength, and a method for producing capacitors with these features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte layer containing π conjugated conductive polymer is formed using conventional methods, then conductivity is improved, but electric strength deteriorates
Solution Approach 1:
The patent uses a composite solid electrolyte layer containing both π conjugated conductive polymer and polyanion, combining materials with different properties to achieve both high conductivity and high electric strength simultaneously
Solution Approach 2:
The patent changes the chemical composition parameters of the solid electrolyte layer by introducing polyanion and controlling the ratio of conductive polymer to polyanion, thereby optimizing both conductivity and electric strength properties
2Volume of moving object
If capacitor size is reduced, then downsizing is achieved, but electrostatic capacity deteriorates
Solution Approach 1:
The patent uses porous valve metal as the anode structure, which provides a large surface area within a small volume, enabling high electrostatic capacity while maintaining compact size
Solution Approach 2:
The patent employs a multi-layer nested structure with porous anode, dielectric layer, and solid electrolyte layer arranged in concentric fashion, maximizing space utilization and maintaining high capacity in reduced volume
3Reliability
If electrolytic polymerization method is used to form conductive film, then conductivity is improved, but manufacturing complexity deteriorates
Solution Approach 1:
The patent extracts and eliminates the intermediate manganese oxide layer step from the conventional electrolytic polymerization process, directly forming the conductive polymer layer on the porous valve metal surface to simplify manufacturing
Solution Approach 2:
The patent performs preliminary surface treatment on the porous valve metal to create optimal surface conditions for direct conductive polymer deposition, eliminating the need for intermediate manganese oxide layer formation
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 proposed solution results in capacitors with low ESR and high electric strength, enabling downsizing while maintaining electrostatic capacity, as evidenced by a capacitance appearance ratio of 70 to 100% and an electric strength to formation voltage ratio of 0.5 to 1.0.
Implementation Method 1
a dielectric layer formed by oxidizing the surface of the anode
Implementation Method 2
a solid electrolyte layer containing a π conjugated conductive polymer
Data Source
AI summary
A capacitor having a high degree of electric strength, a high electrostatic capacity, and a low ESR, which can be readily downsized, is provided. The capacitor according to the present invention includes an anode made of porous valve metal, a dielectric layer formed by oxidizing the surface of the anode, and a solid electrolyte layer formed on the surface of the dielectric layer. The solid electrolyte layer includes a π conjugated conductive polymer, a polyanion, and an ion-conductive compound.