Conductive Polymer Oxidant Dopant Solution for Solid Electrolyte Capacitors
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Solution Overview
Problem
Conductive polymers used in solid electrolyte capacitors often exhibit low voltage resistance and high equivalent series resistance (ESR) when produced with traditional oxidant and dopant solutions, making them unsuitable for high-voltage applications.
Innovation Solution
An oxidant and dopant solution is developed that includes an organic ferric sulfonate, an alcohol with 1 to 4 carbon atoms, and a glycidyl-group-containing compound or its ring-opened compound, which is used for the oxidation polymerization of thiophene or its derivatives to produce conductive polymers with improved ESR and capacitance while maintaining high voltage resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If p-tolueneferric sulfonate is used as oxidant and dopant agent, then low ESR and high capacitance are achieved, but voltage resistance decreases
Solution Approach 1:
The patent changes the chemical structure parameters of the oxidant and dopant agent by replacing p-tolueneferric sulfonate with ferric tosylate, which has different molecular properties. This parameter change in the chemical composition resolves the contradiction by achieving both low ESR/high capacitance and high voltage resistance without leak current defects
Solution Approach 2:
The patent uses a composite oxidant and dopant solution system comprising ferric tosylate in combination with specific solvents (alcohols with 1-4 carbon atoms). This composite material approach allows the system to simultaneously achieve low ESR, high capacitance, and high voltage resistance by combining the effects of different components
2Productivity
If traditional oxidant and dopant solutions are used, then conductive polymer production is simple, but ESR increases and capacitance decreases
Solution Approach 1:
The patent changes the concentration parameters and chemical composition of the oxidant and dopant solution. By optimizing the ferric tosylate concentration and selecting appropriate alcohol solvents (methanol, ethanol, propanol, or butanol), the system achieves high capacitance and low ESR while maintaining simple production processes
Solution Approach 2:
The patent introduces alcohol compounds with 1-4 carbon atoms as intermediary substances in the oxidant and dopant solution. These intermediaries facilitate the oxidation polymerization process and improve the quality of the conductive polymer, resulting in high capacitance and low ESR
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 conductive polymers that exhibit low ESR, high capacitance, and enhanced voltage resistance, reducing the likelihood of leak current defects in solid electrolyte capacitors.
Implementation Method 1
The conductive polymer in such an application can be often made from a thiophene or its derivative by means of the oxidation polymerization
Implementation Method 2
a dopant of an organic sulfonic acid is used
Data Source
AI summary
There is provided an oxidant and dopant which can produce a conductive polymer. The conductive polymer can be used in a solid electrolyte capacitor as solid electrolyte. The solid electrolyte capacitor can be provided with improved breakdown voltage and voltage resistance, as well as less generation of the defects due to leak current. There is provided an oxidant and dopant solution for conductive polymer production including an oxidant and dopant for an organic ferric sulfonate, and an alcohol with a carbon number of 1 to 4. The oxidant and dopant solution further includes a compound with a glycidyl group, or its ring-opened compound. Faborably, a polyalcohol is further added. Using the oxidant and dopant solution, a thiophene or its derivative is subject to an oxidation polymerization to prepare a conductive polymer, which can be used as solid electrolyte of a solid electrolyte capacitor.