Solid Electrolytic Capacitor Adhesion Layer Leakage Current
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Solution Overview
Problem
Conventional solid electrolytic capacitors using in situ-polymerized polymers exhibit high leakage current and fail at high voltages, and while PEDOT:PSS dispersions reduce leakage current, they show a slow decrease over time under applied voltage.
Innovation Solution
A capacitor assembly with a sintered porous anode body, a dielectric, and a solid electrolyte containing an adhesion layer formed from an organometallic compound between inner and outer conductive polymer layers, where the organometallic compound has a specific formula and is applied to reduce leakage current and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If in situ-polymerized polymers are used as solid electrolyte, then ESR is reduced, but leakage current increases and voltage resistance decreases
Solution Approach 1:
The solid electrolyte is divided into multiple functional layers: an inner layer formed by in situ polymerization for low ESR, and an outer layer formed from PEDOT:PSS dispersion for low leakage current and high voltage resistance. This segmentation allows each layer to optimize for its specific function without compromising the other.
Solution Approach 2:
The invention uses a composite solid electrolyte structure combining two different conductive polymer systems: intrinsically conductive polymers (ICPs) in the inner layer and PEDOT:PSS in the outer layer. This composite approach leverages the advantages of both materials to achieve both low ESR and low leakage current with high voltage resistance.
2Reliability
If PEDOT:PSS dispersions are used as solid electrolyte, then leakage current is reduced, but leakage current decreases slowly over time under applied voltage
Solution Approach 1:
The solid electrolyte is divided into multiple functional layers: an inner layer formed by in situ polymerization for low ESR, and an outer layer formed from PEDOT:PSS dispersion for low leakage current and high voltage resistance. This segmentation allows each layer to optimize for its specific function without compromising the other.
Solution Approach 2:
The organometallic adhesion layer acts as an intermediary between the inner ICP layer and outer PEDOT:PSS layer, ensuring strong interfacial adhesion and facilitating optimal charge transfer. This mediator layer enables the outer PEDOT:PSS layer to effectively control leakage current while maintaining fast decay characteristics.
3Ease of manufacture
If conventional solid electrolyte structures are used, then manufacturing is simplified, but performance under high temperature and voltage conditions deteriorates
Solution Approach 1:
The solid electrolyte is divided into multiple functional layers: an inner layer formed by in situ polymerization for low ESR, and an outer layer formed from PEDOT:PSS dispersion for low leakage current and high voltage resistance. This segmentation allows each layer to optimize for its specific function without compromising the other.
Solution Approach 2:
The invention changes the material parameters and structural configuration of the solid electrolyte by introducing a multi-layer architecture with different conductive polymer systems. This parameter change enables the capacitor to maintain stable performance under high temperature and voltage conditions while remaining manufacturable through established coating and drying processes.
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 capacitor assembly achieves low leakage current values, with a rapid decay rate, maintaining low leakage current even under high temperatures and low humidity conditions, demonstrating improved electrical performance and reliability.
Implementation Method 1
The adhesion layer is formed from an organometallic compound positioned between an inner conductive polymer layer and an outer conductive polymer layer
Implementation Method 2
polymerizing a conductive polymer precursor monomer in the presence of an oxidative catalyst to form an inner solid electrolyte layer
Implementation Method 3
anodically oxidizing a sintered porous anode body to form an anode
Data Source
AI summary
A capacitor assembly that is capable of exhibiting good electrical properties even under a variety of conditions is provided. More particularly, the capacitor contains a capacitor element that includes a sintered porous anode body, a dielectric that overlies the anode body, and a solid electrolyte that overlies the dielectric. The solid electrolyte contains an adhesion layer that is positioned between an inner conductive polymer layer and an outer conductive polymer layer. The adhesion layer is formed from an organometallic compound and the outer layer is formed from pre-polymerized conductive polymer particles.