Solid Electrolytic Capacitor Non-Ionic Surfactant Adhesion

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Solution Overview

Problem

Solid electrolytic capacitors with conducting-polymer electrolyte layers experience decreased adhesiveness between the dielectric and electrolyte layers under high-temperature conditions, leading to a decrease in capacitance.

Innovation Solution

Incorporating a non-ionic surfactant in the first conducting polymer layer, specifically polyethylene glycol or polyglycerol, to enhance adhesiveness between the dielectric and electrolyte layers, while ensuring the second conducting polymer layer does not contain the surfactant to maintain high adhesiveness between the two polymer layers, thereby improving preservation characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a conducting polymer electrolyte layer is formed on the dielectric layer, then the equivalent series resistance (ESR) is decreased, but the adhesiveness between the dielectric layer and electrolyte layer decreases under high-temperature conditions

Engineering Contradiction:

Improveequivalent series resistanceVSAvoidadhesiveness between dielectric layer and electrolyte layer

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The invention applies local quality by differentiating the composition of the conducting polymer electrolyte layer into two distinct layers: a first layer containing a non-ionic surfactant that contacts the dielectric layer to ensure adhesiveness, and a second layer without the surfactant that provides optimal conducting properties. This local differentiation allows each layer to perform its specific function effectively, resolving the contradiction between ESR reduction and adhesiveness maintenance under high-temperature conditions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention uses composite materials by combining conducting polymer with a non-ionic surfactant in the first electrolyte layer. This composite structure leverages the conducting properties of the polymer while the surfactant component enhances interfacial adhesion between the dielectric and electrolyte layers, particularly under high-temperature conditions where adhesion would otherwise deteriorate.

Inventive Principle:

Principle #40Composite materials

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 non-ionic surfactants in the first conducting polymer layer effectively prevents capacitance decrease under high-temperature conditions, resulting in solid electrolytic capacitors with excellent preservation characteristics and long-term reliability.

Implementation Method 1

a first conducting polymer layer formed on the dielectric layer, the first conducting polymer layer containing a non-ionic surfactant

Methodology Applied

Scientific EffectSurfactant: Surfactant

Implementation Method 2

adhesiveness between the dielectric layer and the first conducting polymer layer is improved

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS8027151B2Solid electrolytic capacitor

Publication Date: 2011.09.27 SANYO ELECTRIC CO LTD

AI summary

An aspect of the invention provides a solid electrolytic capacitor that comprises: an anode formed of a valve metal or an alloy mainly made of a valve metal; a dielectric layer formed on a surface of the anode; a first conducting polymer layer formed on the dielectric layer, the first conducting polymer layer containing a non-ionic surfactant; a second conducting polymer layer formed on the first conducting polymer layer; and a cathode layer formed on the second conducting polymer layer.