Solid Electrolyte Capacitor with Auxiliary Liquid
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Solution Overview
Problem
Conventional solid electrolyte capacitors using conductive polymers fail to meet high-performance requirements due to limitations in ESR, heat resistance, and reliability, especially under hot conditions, even when combined with electrolyte liquids.
Innovation Solution
An electrolyte capacitor design incorporating a conductive polymer with a conductive auxiliary liquid having a conductivity lower than normal electrolyte liquids, featuring a high boiling point organic solvent and an aromatic compound with a hydroxyl group, which improves ESR and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive polymer is used as a solid electrolyte, then the capacitor has good stability and long life, but the ESR is too high and heat resistance is insufficient
Solution Approach 1:
The patent uses a composite electrolyte system combining conductive polymer (PSSA) with conductive auxiliary liquid containing aromatic compounds with hydroxyl groups. This composite approach allows the solid polymer to provide stability and long life, while the auxiliary liquid reduces ESR and improves heat resistance, resolving the contradiction between reliability and energy loss.
Solution Approach 2:
The patent changes the chemical parameters of the electrolyte by introducing aromatic compounds with hydroxyl groups (such as phenol, cresol, or their derivatives) into the conductive auxiliary liquid. This parameter change enables the liquid to maintain lower conductivity (better stability) while simultaneously reducing ESR and improving heat dissipation properties.
2Loss of energy
If an electrolyte liquid with high conductivity is used, then the ESR is reduced, but the heat resistance and reliability under hot conditions deteriorate
Solution Approach 1:
The patent applies local quality by using aromatic compounds with hydroxyl groups that have specific local molecular structures. These compounds provide conductivity enhancement through their hydroxyl groups while their aromatic ring structure contributes to thermal stability, allowing the electrolyte to have low ESR without sacrificing heat resistance.
Solution Approach 2:
The conductive auxiliary liquid serves as a sacrificial component that can be optimized for short-term conductivity performance (reducing ESR) without compromising the long-term reliability of the entire capacitor. The liquid phase can be replaced or regenerated if needed, while the solid polymer provides enduring 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
The solution results in a solid electrolyte capacitor with reduced ESR and enhanced heat resistance and reliability, surpassing the performance of capacitors using high conductivity electrolyte liquids with conductive polymers.
Implementation Method 1
a high boiling point organic solvent having a boiling point of 150° C. or more
Implementation Method 2
the conductive polymer has such a high conductivity that it is used as a solid electrolyte
Implementation Method 3
the conductive polymers used in such application can be obtained by means of chemical oxidation polymerization or electrolytic oxidation polymerization of thiophene or its derivatives
Data Source
AI summary
There is provided an electrolyte capacitor, which has a low ESR, and is superior in the heat resistance and reliable under a hot condition. The electrolyte capacitors in constructed by including a conductive polymer and a conductive auxiliary liquid having a lower conductivity than usual electrolyte, having a structure below. The conductive auxiliary liquid includes a high boiling point organic solvent having a boiling point of 150° C. or more, and an aromatic compound having at least one hydroxyl group. The aromatic compounds preferably includes an aromatic compound having at least one carboxyl group or an aromatic compound having at least one nitro group, or a combination of an aromatic compound having at least one carboxyl group with an aromatic compound having at least one nitro group.