Electrolytic Capacitor Dual-Alkali Solid Electrolyte
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Solution Overview
Problem
Electrolytic capacitors with solid electrolyte layers containing conductive polymers and polyanions often experience degraded withstand voltage characteristics and increased equivalent series resistance (ESR) in high-temperature environments, particularly when using single types of alkali compounds.
Innovation Solution
Incorporating a combination of inorganic and organic alkali compounds into the solid electrolyte layer, such as ammonia and amine compounds, to form a conductive polymer composite that suppresses corrosion and maintains low ESR, thereby enhancing withstand voltage characteristics and stabilizing ESR in high-temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single type of alkali compound is used in the solid electrolyte layer, then the manufacturing process is simple, but the withstand voltage characteristics are degraded and ESR increases in high-temperature environments
Solution Approach 1:
The patent applies composite materials by combining multiple types of alkali compounds (at least two different kinds) in the solid electrolyte layer. This composite approach creates a synergistic effect where different alkali compounds contribute different properties, resulting in improved withstand voltage characteristics and stable ESR in high-temperature environments while maintaining reasonable manufacturing complexity
Solution Approach 2:
The patent changes the compositional parameter of the solid electrolyte layer by specifying that alkali compounds should constitute 5-50 mass% of the total solid electrolyte layer, with at least two different kinds of alkali compounds used. This parameter optimization resolves the contradiction by finding the right balance between manufacturing simplicity and performance reliability
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 use of a dual-alkali compound approach improves withstand voltage characteristics and maintains low ESR even at elevated temperatures, outperforming single-alkali compound solutions by preventing ESR increase while maintaining enhanced voltage stability.
Implementation Method 1
the conductive polymer and the polyanion are included as a conductive polymer composite
Implementation Method 2
the solid electrolyte layer tends to be acidic, and the dielectric layer is likely to be corroded... when the alkali component is included in the solid electrolyte layer, the corrosion of the dielectric layer due to the polyanion included in the solid electrolyte layer is suppressed
Implementation Method 3
a solid electrolyte layer disposed on the dielectric layer and containing a conductive polymer
Data Source
AI summary
An electrolytic capacitor includes an anode body, a dielectric layer disposed on the anode body, and a solid electrolyte layer disposed on the dielectric layer. The solid electrolyte layer includes a conductive polymer, a polyanion, and an alkali component. The alkali component includes two or more kinds of alkali compound.