Solid Electrolytic Capacitor with Conductive Polymer and Ionic Liquid
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Solution Overview
Problem
Solid electrolytic capacitors with conductive polymer layers face challenges in achieving low equivalent series resistance (ESR) and high breakdown voltage due to the limitations of existing materials, particularly the lack of dielectric coating repair capability and the impact of ionic liquids on conductivity.
Innovation Solution
Incorporating a bis(perfluoroalkanesulfonyl)imide anion (Pf anion) and a high-boiling-point organic solvent into the conductive polymer layer, which enhances breakdown voltage while maintaining low ESR by providing dielectric coating repair functionality and stable solvent presence at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conductive polymer layer is used as a solid electrolyte, then the equivalent series resistance (ESR) is reduced, but the breakdown voltage capability becomes lower due to lack of dielectric coating repair capability
Solution Approach 1:
The patent creates a composite solid electrolyte layer by combining a conductive polymer matrix with ionic liquid molecules dispersed within it. This composite structure allows the material to simultaneously exhibit the low ESR characteristics of conductive polymers and the dielectric repair capability of ionic liquids, resolving the contradiction between energy loss and reliability
Solution Approach 2:
The invention merges two previously separate functional layers (conductive polymer layer and ionic liquid layer) into a single integrated solid electrolyte layer. The ionic liquid molecules are incorporated within the conductive polymer matrix, allowing both materials to work together synergistically to provide both low ESR and high breakdown voltage capability
2Reliability
If an ionic liquid is introduced to provide dielectric coating repair capability, then the breakdown voltage capability is improved, but the equivalent series resistance becomes large due to low conductivity of the ionic liquid itself
Solution Approach 1:
The patent applies local quality by distributing ionic liquid molecules locally within specific regions of the conductive polymer matrix rather than using a uniform structure. This localized incorporation allows ionic liquid to provide dielectric repair functionality where needed while the surrounding conductive polymer maintains overall electrical conductivity, thus improving breakdown voltage without significantly increasing ESR
Solution Approach 2:
The invention changes the concentration and distribution parameters of ionic liquid within the solid electrolyte layer. By optimizing the amount and spatial arrangement of ionic liquid molecules, the patent achieves a balance where sufficient ionic liquid is present to provide dielectric repair capability while maintaining enough conductive polymer to preserve low ESR characteristics
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 solution effectively enhances breakdown voltage and maintains low ESR, preventing damage during soldering and ensuring high-performance solid electrolytic capacitors with improved reliability and efficiency.
Implementation Method 1
an organic solvent having a boiling point of 240° C. or higher are included in the first conductive polymer layer
Implementation Method 2
providing a conductive polymer layer with the dielectric coating repair capability by the presence of an ionic liquid
Data Source
AI summary
A solid electrolytic capacitor includes an anode body, a dielectric coating provided on a surface of the anode body, and a first conductive polymer layer provided on the anode body. The first conductive polymer layer includes a bis(perfluoroalkanesulfonyl)imide anion and an organic solvent having a boiling point of 240° C. or higher.