Conductive Polymer Composition for Solid Electrolytic Capacitors
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Solution Overview
Problem
Existing methods for manufacturing conductive polymers, such as those using acidic group-substituted anilines, face issues with side reactions and byproducts, leading to lower conductivity and insufficient heat resistance, especially in high-temperature applications, and struggle to form conductive polymer layers on rough anodic oxide layers effectively.
Innovation Solution
Incorporating specific compounds with sulfonic acid or carboxyl groups into the conductive polymer composition, particularly aniline-based polymers with repeating units that enhance solubility and conductivity, and using additives like alkali metal hydroxides or carboxylic acids to improve heat resistance and film formability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional methods using acidic group-substituted anilines are used for manufacturing conductive polymers, then the manufacturing process is simpler, but the conductivity and heat resistance are insufficient
Solution Approach 1:
The patent changes the chemical parameters by introducing specific sulfonic acid groups at controlled positions (ortho, meta, or para) and using specific molar ratios of substituents. This parameter optimization resolves the contradiction by achieving high conductivity and heat resistance through precise molecular structure control while maintaining a feasible manufacturing process
Solution Approach 2:
The patent creates a composite conductive polymer structure by combining aniline units with specific sulfonic acid group substitutions. This composite approach at the molecular level achieves superior electrical and thermal properties while keeping the manufacturing process relatively simple through direct polymerization of substituted anilines
2Reliability
If polythiophene-based or poly(paraphenylene vinylene)-based conductive polymers are used to achieve higher conductivity, then the conductivity is improved, but the raw material cost increases and the manufacturing process becomes complex
Solution Approach 1:
The patent uses readily available aniline derivatives as starting materials instead of expensive polythiophene or poly(paraphenylene vinylene) monomers. By substituting costly materials with cheaper aniline-based alternatives and optimizing the substitution pattern, the patent achieves comparable or superior conductivity at lower cost and process complexity
Solution Approach 2:
The patent optimizes the molecular parameters of aniline-based polymers by controlling the type, position, and ratio of sulfonic acid group substitutions. This parameter tuning allows the simpler aniline-based structure to achieve the high conductivity previously only attainable with complex polythiophene or poly(paraphenylene vinylene) structures
3Productivity
If conventional polymerization methods are used without optimization, then the manufacturing process is faster, but side reactions and byproducts increase, reducing conductivity
Solution Approach 1:
The patent performs preliminary structural optimization by pre-selecting aniline derivatives with specific sulfonic acid group substitutions before polymerization. This preliminary action ensures that the polymerization proceeds with minimal side reactions and high conductivity, resolving the contradiction between speed and precision
Solution Approach 2:
The patent optimizes polymerization parameters including monomer structure (specific sulfonic acid substitutions), solvent selection, temperature, and pH control. These parameter changes enable fast polymerization while minimizing side reactions and maximizing conductivity purity
4Device complexity
If existing conductive polymer compositions are used, then the formulation is simpler, but the heat resistance in high-temperature applications is insufficient
Solution Approach 1:
The patent introduces specific sulfonic acid group substitutions at controlled positions and ratios in the aniline polymer structure. This molecular-level parameter change significantly improves heat resistance and thermal stability while maintaining formulation simplicity and avoiding complex additive systems
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 approach results in conductive compositions with improved conductivity, heat resistance, and high capacitance, enabling the production of solid electrolytic capacitors with enhanced electrical performance and stability.
Implementation Method 1
a method for manufacturing aniline-based conductive polymers by polymerizing an acidic group-substituted aniline, such as a sulfonic acid group-substituted aniline or a carboxylic acid group-substituted aniline, using a solution containing a basic compound
Implementation Method 2
A method for enhancing the heat resistance of a conductive composition containing an aniline-based conductive polymer by adding a basic compound to the conductive composition
Implementation Method 3
By immersing a capacitor element in a mixed solution of an oxidation solution and a monomer solution, the capacitor element is impregnated with the oxidant and the monomer, and polymerization reactions of the oxidant and the monomer are accelerated to form a solid electrolyte on the anodic oxide layer
Data Source
AI summary
A conductive composition according to the present invention contains a conductive polymer (A) having a sulfonic acid group and/or a carboxyl group; and an alkali metal hydroxide and/or an alkaline earth metal hydroxide (B). In such a conductive composition, the amount of the hydroxide (B) is set at 0.2˜0.65 mol per 1 mol of a repeating unit that contains a sulfonic acid group and/or a carboxyl group in the conductive polymer (A).