Electrolytic Capacitor Composition for Lower ESR Impedance
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Solution Overview
Problem
The equivalent series resistance (ESR) impedance of electrolytic capacitors using conductive polymers is too high, limiting their performance in high frequency and low impedance applications.
Innovation Solution
A composition for electrolytic capacitors comprising an intrinsically conductive polymer, an electrolyte solution with an organic solvent, an ionic salt compound, and a succinimide-based compound is used, which includes polythiophene derivatives and doping agents like sulfonic acid compounds, along with specific ionic salts and solvents such as sulfolane, to enhance conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conductive polymers are used as solid electrolytes in electrolytic capacitors, then high-temperature insulation properties are improved, but equivalent series resistance (ESR) impedance becomes too high
Solution Approach 1:
The patent uses composite materials by combining intrinsically conductive polymers with electrolyte solutions containing ionic liquid and cyclic carbonate. This composite electrolyte system integrates the high-temperature insulation properties of conductive polymers with the low resistance characteristics of ionic liquids, resolving the contradiction between temperature resistance and ESR impedance.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolyte by introducing specific ionic liquids (imidazolium, pyridinium, pyrrolidinium salts) and cyclic carbonates in controlled ratios. This parameter optimization reduces ESR impedance while preserving the high-temperature stability provided by the conductive polymer matrix.
2Reliability
If conventional liquid electrolytes or solid organic semiconductor zirconium salts are used, then equivalent series resistance is reduced, but conductivity and high-frequency performance are insufficient
Solution Approach 1:
The patent creates a composite electrolyte system that combines intrinsically conductive polymers with ionic liquids and cyclic carbonates. This composite structure achieves both low equivalent series resistance from the ionic liquid component and high conductivity with superior high-frequency performance from the conductive polymer matrix, overcoming the limitations of conventional single-material electrolytes.
Solution Approach 2:
The patent applies local quality by having the intrinsically conductive polymer primarily provide high-temperature insulation properties while the electrolyte solution component (ionic liquid + cyclic carbonate) provides high conductivity and low ESR. Each material performs its specialized function locally within the composite electrolyte system, achieving overall superior performance.
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 composition effectively reduces the ESR impedance, improving the capacitors' performance by enhancing conductivity and maintaining high capacitance.
Implementation Method 1
The intrinsically conductive polymer of the disclosure may include polythiophene, polypyrrole, poly(p-phenylene vinylene), polyphenylene sulfide or polyaniline, and derivatives thereof... The doping method of the intrinsically conductive polymer may be: the intrinsically conductive polymer is first polymerized into a conjugated polymer and then a dopant is added for doping
Implementation Method 2
The electrolyte solution includes an organic solvent, an ionic salt compound, and a succinimide-based compound... electrolytes with high conductivity can reduce the equivalent series resistance of capacitors
Data Source
AI summary
A composition for an electrolytic capacitor and an electrolytic capacitor including the composition is provided. The composition includes an intrinsically conductive polymer and an electrolyte solution. The electrolyte solution includes an organic solvent, an ionic salt compound and a succinimide-based compound.