Solid Electrolytic Capacitor Ionic Liquid Composite
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Solid electrolytic capacitors with conductive polymer layers lack ion conductivity, which limits their withstand voltage performance and ability to repair damaged dielectric films, making them inferior to other capacitors in terms of durability and voltage handling.
Innovation Solution
Incorporating an ionic liquid with a cation component having two or more ether linkages into the conductive polymer layer to enhance the repair of dielectric films and improve withstand voltage performance, achieved by forming a dielectric film on an anode element and then forming a conductive polymer layer with the ionic liquid using monomer polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conductive polymer layer is used as solid electrolyte, then equivalent series resistance (ESR) is lowered, but ion conductivity is lost and withstand voltage performance deteriorates
Solution Approach 1:
The patent combines conductive polymer and ionic liquid into a composite solid electrolyte layer. The conductive polymer provides low ESR through its high electronic conductivity, while the ionic liquid contributes ion conductivity and dielectric repair capabilities. This merging of materials allows the capacitor to simultaneously achieve low energy loss and high reliability.
Solution Approach 2:
The invention uses a composite material system consisting of conductive polymer matrix integrated with ionic liquid. This composite structure enables the electrolyte to exhibit both electronic conductivity (from polymer) and ion conductivity (from ionic liquid), resolving the contradiction between low ESR and high withstand voltage performance.
2Loss of energy
If a conductive polymer layer is used as solid electrolyte, then ESR is reduced, but the ability to repair damaged dielectric films is lost
Solution Approach 1:
The patent merges the functions of conductive polymer (providing low ESR) and ionic liquid (providing dielectric repair capability through oxygen supply) into a single composite solid electrolyte layer. This allows the capacitor to maintain low energy loss while regaining the ability to self-heal damaged dielectric films.
Solution Approach 2:
The ionic liquid acts as an intermediary substance that facilitates dielectric film repair by supplying oxygen to damaged areas. Meanwhile, the conductive polymer matrix maintains low ESR. The intermediary ionic liquid enables the repair function without compromising the low-resistance characteristic.
3Reliability
If ionic liquid is added to conductive polymer layer, then withstand voltage performance is improved, but device complexity increases
Solution Approach 1:
The patent merges ionic liquid and conductive polymer into a single integrated solid electrolyte layer rather than creating separate layers. This merging approach improves withstand voltage performance while minimizing structural complexity, as the composite electrolyte performs multiple functions within one layer.
Solution Approach 2:
The composite solid electrolyte layer performs multiple functions simultaneously: it provides ion conductivity, maintains low ESR through the conductive polymer, enables dielectric repair via ionic liquid, and offers electrical insulation. This multi-functionality within a single layer structure avoids increasing device complexity.
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 ionic liquids with ether linkages significantly improves the withstand voltage performance and resistance to surges in solid electrolytic capacitors, while maintaining low equivalent series resistance (ESR), resulting in a high-performance capacitor.
Implementation Method 1
a dielectric film can be formed by subjecting a surface of such an anode element to electrolytic oxidation
Implementation Method 2
by polymerizing the monomer
Data Source
AI summary
A solid electrolytic capacitor includes a solid electrolytic capacitor element having an anode element having a dielectric film formed on a surface thereof and a conductive polymer layer formed on the anode element, an ionic liquid composed of an anion component and a cation component is present in the conductive polymer layer, and the cation component contains a cation having two or more ether linkages.