Conductive Polymer Electrolytic Capacitor Electrolyte for Low ESR
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Solution Overview
Problem
Conventional electrolytic capacitors with conductive polymers and liquid components face degradation and increased equivalent series resistance (ESR) in high-temperature environments due to esterification reactions and dedoping of the dopant, which affects electrostatic capacity and conductivity.
Innovation Solution
An electrolytic capacitor design incorporating a liquid component with an acid component, a base component, and an aromatic additive, where the acid component includes aromatic carboxylic acids with multiple carboxyl groups and aromatic rings, and the aromatic additive has electron withdrawing and donating groups, is used to stabilize the conductive polymer and maintain low ESR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional liquid component is used in the electrolytic capacitor, then the capacitor can operate at high temperatures, but the conductive polymer degrades and ESR increases due to esterification reactions and dedoping
Solution Approach 1:
The patent introduces a specific liquid component composition acting as an intermediary between the conductive polymer and high-temperature environment. The liquid component contains a base component (1-50 wt%), acid component (0.1-10 wt%), and aromatic additive (5-50 wt%), which mediates the interaction to prevent direct harmful effects of high temperature on the conductive polymer, thereby maintaining stability while enabling high-temperature operation
Solution Approach 2:
The patent changes the chemical composition parameters of the liquid component to resolve the contradiction. By specifying precise weight ratio ranges of base component, acid component, and aromatic additive, the liquid component's chemical properties are optimized to suppress esterification reactions and dedoping at high temperatures, thus maintaining conductive polymer stability while allowing elevated operating temperatures
2Reliability
If the conductive polymer is used to achieve low ESR, then the electrostatic capacity increases, but the polymer undergoes dedoping and degradation over time
Solution Approach 1:
The patent applies preliminary action by incorporating the specifically formulated liquid component (with base component, acid component, and aromatic additive in precise ratios) into the electrolytic capacitor before operation. This pre-configured liquid component environment prevents dedoping and degradation from the outset, allowing the conductive polymer to maintain its low-ESR properties and high electrostatic capacity throughout the extended service life without significant degradation
Solution Approach 2:
The liquid component serves as a protective intermediary between the conductive polymer and degrading factors. The base component, acid component, and aromatic additive work together to create a stable chemical environment that mediates against dedoping reactions, thereby preserving the conductive polymer's performance and extending the capacitor's operational lifespan
3Adaptability or versatility
If high-temperature operation is enabled, then the capacitor can function in harsh environments, but esterification reactions occur causing performance degradation
Solution Approach 1:
The patent modifies the liquid component's composition parameters to achieve both high-temperature adaptability and compositional stability. By formulating the liquid component with specific weight ratios of base component (1-50 wt%), acid component (0.1-10 wt%), and aromatic additive (5-50 wt%), the chemical stability is enhanced to resist esterification reactions even at elevated temperatures, thus maintaining both environmental adaptability and composition 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
This configuration enhances electrostatic capacity, suppresses dedoping, and maintains low ESR even in high-temperature environments, ensuring long-term reliability and stability of the capacitor.
Implementation Method 1
the aromatic compound having at least one hydroxyl group has ability to assist electronic conduction of the conductive polymer
Implementation Method 2
can prevent degradation of the conductive polymer by its antioxidant action
Data Source
AI summary
An electrolytic capacitor includes an anode body, a cathode body, and a conductive polymer and a liquid component that are disposed between the anode body and the cathode body. The liquid component contains an acid component, a base component, and an aromatic additive. The acid component includes at least one of an aromatic carboxylic acid and an aromatic carboxylic acid derivative. The at least one of the aromatic carboxylic acid and the aromatic carboxylic acid derivative includes at least two carboxy groups and at least one aromatic ring. A content proportion of the base component in the liquid component is more than or equal to 1% by mass. The aromatic additive includes an electron withdrawing group and an electron donating group. A content ratio of the aromatic additive contained in the liquid component is more than or equal to 50 parts by mass with respect to 100 parts by mass of the conductive polymer.