Electrolytic Capacitor Solid Electrolyte Layer ESR Reduction
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Solution Overview
Problem
Conventional electrolytic capacitors face limitations in reducing equivalent series resistance (ESR) due to issues with permeability and film formation of conductive polymer layers, particularly when surfactants and phosphates are used, which can lead to aggregation and deteriorated performance.
Innovation Solution
Incorporating a solid electrolyte layer with a conductive polymer, an anion corresponding to phosphorus-containing oxoacids or carboxylic acids, and a nitrogen-containing cation, which improves permeability and film formation, reducing ESR by enhancing electric conductivity and suppressing polymer aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a suspension containing a conductive polymer and a cationic surfactant is used for forming a solid electrolyte layer, then permeability into an anode body is improved, but film formation property deteriorates due to aggregation
Solution Approach 1:
A cationic polymer is introduced as an intermediary substance between the cationic surfactant and the conductive polymer. The cationic polymer interacts with both the surfactant and conductive polymer, preventing aggregation while maintaining permeability. This mediator resolves the contradiction by enabling the surfactant to improve permeability without causing the conductive polymer to aggregate and deteriorate film formation.
Solution Approach 2:
The invention creates a composite system comprising conductive polymer, cationic surfactant, and cationic polymer working together in the suspension. This composite approach allows the surfactant to provide permeability enhancement while the cationic polymer counteracts aggregation, achieving both improved permeability and maintained film formation property simultaneously.
2Reliability
If phosphoric acid or a phosphate is added to a solution containing a conductive polymer, then withstand voltage is increased, but ESR reduction is limited due to aggregation
Solution Approach 1:
The cationic polymer serves as a mediator that allows phosphoric acid or phosphate to be added for increasing withstand voltage without causing conductive polymer aggregation. The intermediary prevents the harmful interaction between phosphate and conductive polymer, enabling simultaneous achievement of high withstand voltage and low ESR.
Solution Approach 2:
The invention changes the chemical environment by introducing a cationic polymer that modifies the interaction parameters between phosphate and conductive polymer. This parameter change enables the system to tolerate higher phosphate concentrations for voltage enhancement while maintaining low ESR through prevented aggregation.
3Loss of energy
If the concentration of conductive polymer is increased to reduce ESR, then electric conductivity improves, but permeability into anode body deteriorates
Solution Approach 1:
The cationic polymer acts as a dispersing intermediary that maintains uniform distribution of high concentrations of conductive polymer in the suspension. This intermediary prevents aggregation even at high concentrations, enabling both high permeability and low ESR to be achieved simultaneously.
Solution Approach 2:
The invention changes the suspension parameters by adding cationic polymer, which modifies the rheological and interaction properties of the system. This parameter change allows high conductive polymer concentration to be maintained without sacrificing permeability, resolving the contradiction between ESR reduction and permeability.
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 proposed solution results in improved film formation properties and reduced ESR, leading to higher capacitance and lower resistance in electrolytic capacitors, effectively addressing the limitations of existing technologies.
Implementation Method 1
improving permeability into an anode body
Implementation Method 2
film formation property of conductive polymer
Implementation Method 3
suppressing polymer aggregation
Data Source
AI summary
An electrolytic capacitor includes an anode body having a dielectric layer, and a solid electrolyte layer including a conductive polymer. The solid electrolyte layer includes the conductive polymer, an anion, and a cation. The anion is an anion corresponding to at least one acid selected from the group consisting of a phosphorus-containing oxoacid, sulfuric acid, and a carboxylic acid. The cation is a nitrogen-containing cation.