Electroconductive Polymer Material Cross-Linking for Low ESR
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Solution Overview
Problem
Conventional electroconductive polymer materials used in solid electrolyte capacitors suffer from time-related deterioration due to weak connections between polymer particles, leading to increased equivalent series resistance (ESR) when exposed to heat or stress.
Innovation Solution
An electroconductive polymer suspension solution containing a polymer, polyanion, organic dispersant with a branched structure and adsorption groups, and a cross-linker with oxazoline groups, which forms strong bonds between polymer particles upon drying, enhancing conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional electroconductive polymer material composed of electroconductive polymer particles, polyanion and binder is used, then adhesiveness with condenser body is improved and ESR is reduced, but connection between electroconductive polymer particles is weak and likely to be broken by heat or stress, resulting in time-related deterioration of electroconductivity
Solution Approach 1:
The patent introduces a cross-linker as an intermediary substance that mediates between electroconductive polymer particles. This cross-linker forms cross-linking bonds that bridge adjacent particles, creating a robust network structure that maintains particle connections under thermal and mechanical stress while preserving electrical conductivity pathways.
Solution Approach 2:
The patent creates a composite material system comprising electroconductive polymer particles, polyanion, binder, and cross-linker. This multi-component composite structure combines the adhesive properties of the binder with the cross-linking reinforcement, achieving both strong adhesion to the condenser body and enhanced inter-particle connection stability for long-term reliability.
2Loss of energy
If conventional electroconductive polymer material is used, then ESR is initially low, but ESR increases due to broken connections between particles over time under heat or stress
Solution Approach 1:
The patent applies beforehand cushioning by pre-establishing cross-linking bonds between electroconductive polymer particles before the material is subjected to operational conditions. This cross-linked network structure provides preemptive reinforcement that cushions against thermal expansion, mechanical stress, and particle displacement that would otherwise occur during capacitor operation, thereby preventing ESR increase over time.
3Reliability
If electroconductive polymer particles are closely connected to maintain high electroconductivity, then conductivity is high, but the structure becomes vulnerable to heat and stress causing connection breakdown
Solution Approach 1:
The patent applies local quality by creating different types of connections at different locations within the material structure. The cross-linker provides localized reinforcement at particle-particle interfaces, while maintaining the overall close connection necessary for electrical conductivity. This localized strengthening at critical junction points allows the material to maintain both high conductivity and resistance to connection breakdown under stress.
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 results in a high electroconductivity electroconductive polymer material that suppresses time-related deterioration, leading to a low ESR and improved reliability in electrolytic capacitors.
Implementation Method 1
an organic dispersant with a branched structure and a structure which has an adsorption group in a main chain to be adsorbed to the electroconductive polymer
Implementation Method 2
at least one cross-linker... electroconductive polymer particles are bonded to each other via the organic dispersant and the cross-linker
Implementation Method 3
an electroconductive polymer material obtained by a heat-drying of the electroconductive polymer suspension solution to remove a solvent
Data Source
AI summary
The present invention provides an electroconductive polymer suspension solution and an electroconductive polymer material which has a high electroconductivity and in which the time-related deterioration of the electroconductivity is suppressed. Also, the present invention provides an electrolytic capacitor with a low ESR using the electroconductive polymer material as a solid electrolyte and a method for producing the same.In the present invention, electroconductive polymer particles 1 in the electroconductive polymer material are bonded via organic dispersant 2 and cross-linker 3 to obtain a strong bond between electroconductive polymer particles 1.