Solid Electrolytic Capacitor Silane Coupling Leakage Current

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Solution Overview

Problem

Solid electrolytic capacitors face challenges in reducing leakage current, which is not adequately addressed by existing technologies, necessitating further improvement to meet the demands of downsized and high-frequency electronic devices.

Innovation Solution

A solid electrolytic capacitor design incorporating a solid electrolyte layer with a combination of first and second silicon-containing components, specifically silane coupling agents and their residues, which include different functional groups and hydrolytically condensable groups, to enhance bonding force and affinity between conductive polymer chains, thereby suppressing leakage current.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single silane coupling agent is added into the solid electrolyte layer, then leakage current is reduced, but further improvement is desired to reduce leakage current generation

Engineering Contradiction:

Improveleakage current suppressionVSAvoidsolid electrolyte layer composition

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies composite materials by combining multiple silane coupling agents (first and second silane coupling agents with different functional groups) within the solid electrolyte layer. This composite approach allows the layer to achieve superior leakage current suppression compared to using a single silane coupling agent, while the functional groups provide complementary bonding mechanisms to conductive polymer chains

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent implements local quality by introducing silane coupling agents with different functional groups at specific locations within the solid electrolyte layer. Each silane coupling agent type targets specific bonding requirements, creating localized zones of enhanced affinity and bonding force with conductive polymer chains, thereby optimizing leakage current suppression throughout the layer

Inventive Principle:

Principle #3Local quality

2Strength

If silane coupling agents are added to reduce leakage current, then bonding force between conductive polymer chains is enhanced, but equivalent series resistance (ESR) must be maintained low

Engineering Contradiction:

Improvebonding force between conductive polymer chainsVSAvoidequivalent series resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent applies parameter changes by carefully controlling the types and concentrations of different silane coupling agents in the solid electrolyte layer. By adjusting the functional group composition and ratios, the patent optimizes the balance between bonding force enhancement and electrical conductivity maintenance, ensuring low ESR while achieving strong polymer chain bonding

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements local quality by distributing different silane coupling agents with specific functional groups to different regions of the solid electrolyte layer. This localized distribution ensures that bonding enhancement occurs where needed while maintaining electrical conductivity pathways, preventing excessive ESR increase

Inventive Principle:

Principle #3Local quality

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 effectively reduces leakage current and improves withstand voltage characteristics while maintaining high electrical conductivity and low equivalent series resistance (ESR), achieving a balance between performance and component concentration.

Implementation Method 1

a first silane coupling agent including a first substituent that has a first functional group and is bonded with a silicon atom, and a hydrolytically condensable group, the second silane coupling agent including a second substituent that has a second functional group and is bonded with a silicon atom, and a hydrolytically condensable group

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 2

Methodology Applied

Scientific EffectCondensation: Condensation

Data Source

PatentUS10269501B2Solid electrolytic capacitor, and production method therefor

Publication Date: 2019.04.23 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

Provided is a solid electrolytic capacitor including an anode body, a dielectric layer formed on the anode body, and a solid electrolyte layer that covers at least a part of the dielectric layer and includes a conductive polymer, the solid electrolyte layer including a first silicon-containing component and a second silicon-containing component, the first silicon-containing component being at least one selected from the group consisting of a first silane coupling agent and residues of the first silane coupling agent, the second silicon-containing component being at least one selected from the group consisting of a second silane coupling agent and residues of the second silane coupling agent, the first silane coupling agent including a first substituent that has a first functional group and is bonded with a silicon atom, and a hydrolytically condensable group, the second silane coupling agent including a second substituent that has a second functional group and is bonded with a silicon atom, and a hydrolytically condensable group, and the first substituent and the second substituent being different from each other.