Electrolytic Capacitor Liquid Component for Metal Ion Chelation

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Solution Overview

Problem

Electrolytic capacitors experience increased leakage current due to metal ions from oxidizing agents used in the production of conductive polymer components, which affects the capacitor's conductivity and equivalent series resistance (ESR).

Innovation Solution

Incorporating a chelating agent into the liquid component of the electrolytic capacitor, which forms complexes with metal ions, thereby reducing leakage current and preventing oxidation degradation of the conductive polymer component.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If metal ions from oxidizing agents are used in the production of conductive polymer components, then the conductive polymer component can be produced, but leakage current increases

Engineering Contradiction:

Improveconductive polymer component productionVSAvoidleakage current

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

A chelating agent is introduced as an intermediary substance that forms complexes with metal ions in the liquid component. This mediator captures the harmful metal ions (such as iron from ferric p-toluenesulfonate used in chemical polymerization) without interfering with the conductive polymer component production, thereby reducing leakage current while maintaining ease of manufacture

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The harmful effect of metal ions causing increased leakage current is converted into a beneficial situation by using the chelating agent to form stable complexes with these metal ions. The metal ions that would otherwise degrade the capacitor performance are transformed into harmless chelated complexes, effectively converting a manufacturing advantage (use of metal-based oxidizing agents) into a reliability issue that is then resolved

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Ease of manufacture

If metal ions are present in the liquid component, then the conductive polymer component can be formed through chemical polymerization, but the equivalent series resistance (ESR) increases

Engineering Contradiction:

Improveconductive polymer component formationVSAvoidequivalent series resistance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The chelating agent acts as an intermediary that selectively binds to metal ions in the liquid component, preventing them from causing oxidation degradation of the conductive polymer component. This maintains low ESR while allowing the chemical polymerization process to proceed normally for conductive polymer formation

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If the liquid component contains metal ions from oxidizing agents, then the conductive polymer component can be produced, but oxidation degradation occurs

Engineering Contradiction:

Improveconductive polymer component productionVSAvoidconductive polymer component stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The chelating agent serves as a protective intermediary that forms stable complexes with metal ions, preventing these ions from causing oxidation degradation of the conductive polymer component. This maintains the stability and longevity of the capacitor while preserving the ease of conductive polymer production through chemical polymerization

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The chelating agent is incorporated into the liquid component before the conductive polymer component is formed, performing preliminary protection against metal ion-induced oxidation degradation. This preliminary action ensures that when the conductive polymer is produced via chemical polymerization using metal-based oxidizing agents, the polymer remains stable and resistant to degradation

Inventive Principle:

Principle #10Preliminary action

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 chelating agent effectively captures metal ions, reducing leakage current and maintaining low ESR, thus enhancing the capacitor's performance and longevity.

Implementation Method 1

The liquid component includes a chelating agent... the chelating agent effectively captures metal ions, reducing leakage current

Methodology Applied

Scientific EffectChelation:

Data Source

PatentUS20240177942A1Liquid component for electrolytic capacitor and electrolytic capacitor

Publication Date: 2024.05.30 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

An electrolytic capacitor includes a capacitor element and a liquid component. The capacitor element includes an anode body that includes a dielectric layer on a surface of the anode body, and a solid electrolyte layer that covers at least a part of a surface of the dielectric layer. The solid electrolyte layer contains a conductive polymer component, and the liquid component contains a chelating agent.