Anthraquinone Dopant Salts for Heat-Resistant Conductive Capacitors
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Solution Overview
Problem
The existing methods for manufacturing electrolytic capacitors face challenges in achieving excellent heat resistance due to the corrosion issues caused by sulfonic acids with high acidity and the limited solubility of salts like sodium anthraquinone sulfonate or ammonium anthraquinone sulfonate, which restricts the amount of dopant that can be introduced into the conductive polymer, limiting the conductivity and the number of polymerizations required to form a solid electrolyte layer.
Innovation Solution
A dopant solution containing a sulfonic acid with an anthraquinone skeleton and a solvent such as water or a lower alcohol, combined with alkylamine, alkanolamine, or hydroxylamine, which increases the solubility and allows for a higher concentration of the dopant, enabling more efficient polymerization and the formation of a conductive composition with improved conductivity and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If sulfonic acid having an anthraquinone skeleton is used as a dopant, then heat resistance of electrolytic capacitors is improved, but corrosion of capacitor elements occurs due to high acidity
Solution Approach 1:
The patent introduces an intermediary substance (base component such as alkylamine, alkanolamine, or heterocyclic amine) that mediates between the anthraquinone sulfonic acid and the capacitor element. The base neutralizes the acid to form a salt, reducing corrosiveness while preserving the heat resistance benefits of the anthraquinone structure.
Solution Approach 2:
The patent changes the chemical parameter of the dopant from acidic form (anthraquinone sulfonic acid) to neutralized form (salt with base component). This parameter change transforms the substance from corrosive to non-corrosive while maintaining the essential anthraquinone skeleton for heat resistance.
2Object-affected harmful factors
If salts such as sodium anthraquinone sulfonate or ammonium anthraquinone sulfonate are used to avoid corrosion, then corrosion problem is avoided, but solubility in lower alcohols and water is extremely low
Solution Approach 1:
The patent changes the counterion parameter of the salt from traditional ions (Na+, NH4+) to organic base cations (alkylamine, alkanolamine, or heterocyclic amine). This parameter change dramatically improves solubility in water and lower alcohols while maintaining the non-corrosive property.
Solution Approach 2:
The patent creates a composite dopant structure combining the anthraquinone sulfonate anion with organic base cations. This composite material exhibits both the corrosion resistance of neutralized salts and the high solubility characteristic of organic compounds in alcohol and water solvents.
3Object-affected harmful factors
If low solubility salts are used as dopants, then corrosion is avoided, but the amount of dopant that can be introduced into conductive polymer is limited
Solution Approach 1:
The patent changes the solubility parameter of the dopant salt by selecting organic base cations with appropriate hydrophobic/hydrophilic balance. This enables high concentrations of dopant (10-50 wt% or more) to be achieved in the polymer while maintaining processability and avoiding corrosion.
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 approach allows for the production of electrolytic capacitors with enhanced heat resistance and increased conductivity, reducing the need for multiple polymerization steps and minimizing corrosion risks, resulting in improved capacitor performance.
Implementation Method 1
A dopant solution for conductive polymers has dissolved a dopant for conductive polymers in a solvent
Implementation Method 2
the monomers are polymerized to form a conductive polymer (conductive composition) on the capacitor element
Data Source
AI summary
The present invention provides an electrolytic capacitor with excellent heat resistance, a method for manufacturing the same, a conductive composition that can constitute the electrolytic capacitor, a method for manufacturing the same, and a dopant solution and a monomer liquid for manufacturing the conductive composition. The dopant solution for a conductive polymer of the present invention comprises a dopant for a conductive polymer, the dopant dissolved in a solvent, and the dopant for the conductive polymer comprises a salt (A) of: a sulfonic acid having an anthraquinone skeleton; and one of specific alkylamine, specific alkanolamine, specific hydroxylamine and specific compound having a heterocycle having 1 to 3 nitrogen atoms in a ring thereof; and water or a lower alcohol is included as a solvent.