Electrolytic Capacitor Conductive Polymer Dopant Leakage Current
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Solution Overview
Problem
Existing electrolytic capacitors face limitations in reducing leakage currents due to the limitations of polymer dopants with sulfonate groups in enhancing conductivity and dielectric layer repair.
Innovation Solution
Incorporating a conductive polymer layer with a polymer dopant containing a first unit from a monomer with a sulfonate group and a second unit from a monomer with a phosphorus-containing group, represented by specific general formulae, to enhance the dielectric-layer-repairing function and decrease leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the conductive polymer layer is optimized for conductivity, then the ESR is reduced, but the dispersibility and processing characteristics deteriorate
Solution Approach 1:
The patent modifies the chemical parameters of the polymer dopant by incorporating phosphorus-containing groups with specific structural characteristics (general formulae (1) to (3)). These parameter changes in the dopant structure improve the overall dispersibility of the conductive polymer layer while maintaining the conductivity enhancement needed for low ESR 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 use of a copolymer or polymer dopant with a balanced proportion of these units improves the conductivity and dispersibility of the conductive polymer layer, effectively reducing leakage currents and enhancing the dielectric-layer-repairing function, leading to improved performance in electrolytic capacitors.
Implementation Method 1
The use of the copolymer or the polymer dopant including the second unit enhances an effect of repairing the dielectric layer
Implementation Method 2
The polymer dopant includes: (A) a first unit originating from a first monomer having a polymerizable group and a sulfonate group; and (B) a second unit originating from a second monomer having a polymerizable group and a phosphorus-containing group
Data Source
AI summary
A conductive polymer layer of a electrolytic capacitor includes a conductive polymer and a polymer dopant. The polymer dopant includes; (A) a first unit originating from a first monomer having a polymerizable group and a sulfonate group; and (B) a second unit originating from a second monomer having a polymerizable group and a phosphorus-containing group. The phosphorus-containing group is represented by at least one of general formula (1); —P(═O)(OR1)(OR2), general formula (2); —PH(═O)(OR3), and general formula (3); —PH2(═O). In the general formulae (1) to (3), each of R1, R2 and R3 is independently a hydrogen atom, a hydrophilic group, a C1 to C3 alkyl group, or a cationic group.