Electrolytic Capacitor Polymer-Electrolyte Matching for Stable ESR
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Solution Overview
Problem
There is a desire for an electrolytic capacitor with a low initial equivalent series resistance (ESR) and a small change in ESR over time (ΔESR).
Innovation Solution
An electrolytic capacitor is designed with a capacitor element that includes an anode foil with a dielectric layer and a conductive polymer component in contact with the dielectric layer. The conductive polymer component contains a self-doped conductive polymer, and the difference between the Hansen solubility parameter of the self-doped conductive polymer and the liquid component is within the range of 9.0 MPa0.5 to 11.4 MPa0.5.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive polymer component containing a self-doped conductive polymer is used with a liquid component, then the initial ESR can be reduced, but the change in ESR over time (ΔESR) increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Hansen solubility parameter difference (ΔHSP) between the self-doped conductive polymer and the liquid component to be within 9.0 to 11.4 MPa^0.5. This specific parameter range optimizes the balance between initial conductivity (low ESR) and long-term stability (small ΔESR), resolving the contradiction between initial performance and durability.
2Reliability
If the Hansen solubility parameter difference between the self-doped conductive polymer and the liquid component is increased, then the initial ESR decreases, but the stability over time deteriorates
Solution Approach 1:
The patent identifies and controls the critical parameter of Hansen solubility parameter difference (ΔHSP) within the specific range of 9.0 to 11.4 MPa^0.5. This parameter optimization ensures that the conductive polymer maintains sufficient initial conductivity while preventing excessive dissolution or degradation over time, thereby achieving both low initial ESR and long-term stability.
3Reliability
If a self-doped conductive polymer is used to achieve high conductivity, then the initial ESR is reduced, but the dissolution in liquid component increases causing ΔESR to increase
Solution Approach 1:
The patent controls the Hansen solubility parameter difference to fall within the optimal range of 9.0 to 11.4 MPa^0.5, which strikes a balance between maintaining high initial conductivity and minimizing polymer dissolution. This parameter control prevents excessive loss of conductive polymer material while ensuring low initial ESR.
Solution Approach 2:
The patent employs a composite system combining a self-doped conductive polymer with a liquid component, where the specific solubility parameter relationship between the two materials is optimized. This composite approach leverages the high conductivity of the self-doped polymer while the controlled solubility difference prevents excessive dissolution, maintaining both initial performance and long-term stability.
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
This configuration allows for maintaining low initial ESR and ΔESR over time, ensuring high conductivity and stability of the electrolytic capacitor.
Implementation Method 1
a difference ΔHSP1 between a Hansen solubility parameter HSPp of the self-doped conductive polymer and a Hansen solubility parameter HSPe of the liquid component is 9.0 MPa0.5 or more and 11.4 MPa0.5 or less
Data Source
AI summary
Provided is an electrolytic capacitor including a capacitor element and a liquid component. The capacitor element includes an anode foil having a dielectric layer on a surface of the anode foil, and a conductive polymer component in contact with at least a portion of the dielectric layer. The conductive polymer component contains a self-doped conductive polymer. A difference ΔHSP1 between a Hansen solubility parameter HSPp of the self-doped conductive polymer and a Hansen solubility parameter HSPe of the liquid component is 9.0 MPa0.5 or more and 11.4 MPa0.5 or less.