Electrolyte Capacitor Conductive Polymer Leak Current Reduction
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Solution Overview
Problem
Conductive polymers used in electrolyte capacitors, particularly those employing ferric salts as oxidant dopant agents, suffer from high leak current issues, especially at elevated temperatures, which affects their performance and reliability.
Innovation Solution
An oxidant dopant agent comprising organic ferric sulfonate combined with phosphoric acid, phosphate, phosphorous acid, or their derivatives, along with a glycidyl group containing compound, is used to prepare conductive polymers, reducing leak current and enhancing breakdown voltage in electrolyte capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferric salts of organic sulfonic acid are used as oxidant dopant agent, then conductive polymer can be produced, but the electrolyte capacitor exhibits large amounts of leak current especially at high temperature
Solution Approach 1:
The patent changes the chemical parameters of the oxidant dopant agent by using organic ferric sulfonate combined with specific additives (phosphoric acid type, phosphorous acid type, boric acid type, thiophosphoric acid type, or dithiophosphoric acid type additives) in controlled amounts (0.1-10 wt%). This parameter modification resolves the contradiction by maintaining polymerization effectiveness while suppressing leak current at high temperatures through the synergistic chemical interaction between the ferric sulfonate and the added compounds.
Solution Approach 2:
The patent creates a composite oxidant dopant agent system by combining organic ferric sulfonate with specific additive compounds. This composite approach allows the system to exhibit both the polymerization catalytic activity of ferric sulfonate and the leak current suppression properties of the additive compounds, particularly at elevated temperatures, thus resolving the technical contradiction.
2Strength
If conventional oxidant dopant agents are used, then conductive polymer production is achieved, but breakdown voltage and withstanding voltage properties are insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the oxidant dopant agent by incorporating specific additives in controlled concentrations. This parameter optimization enhances the breakdown voltage and withstanding voltage properties of the resulting conductive polymer electrolyte while maintaining ease of manufacture through a straightforward mixing and polymerization process.
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 minimizes leak current and improves the breakdown voltage of electrolyte capacitors, ensuring better performance and reliability across varying temperature conditions.
Implementation Method 1
The conductive polymers used in such an application can be obtained by means of chemical oxidation polymerization or electrolytic oxidation polymerization of, for example, thiophene or its derivatives.
Implementation Method 2
Having a high conductivity, conductive polymers have been used as an electrolyte in aluminum electrolyte capacitors
Data Source
AI summary
The method for preparing an electrolyte capacitor includes: providing an oxidant dopant agent for preparing the conductive polymer including: ferric naphthalenesulfonate; and at least one compound selected from the group consisting of phosphate, phosphite, borate, thiophosphate, and dithiophosphate. The method also includes preparing a conductive polymer by using the oxidant dopant agent to obtain an electrolyte comprising the conductive polymer.