Multi-layered Adhesion Coating for Solid Electrolytic Capacitors
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Solution Overview
Problem
Conventional solid electrolytic capacitors face challenges in achieving ultralow equivalent series resistance (ESR) and leakage current due to difficulties in penetrating and uniformly coating the anode with conductive polymer electrolytes, leading to delamination and reduced electrical performance.
Innovation Solution
A solid electrolytic capacitor design featuring a multi-layered adhesion coating with a discontinuous precoat layer containing discrete nanoprojections of manganese oxide and a resinous layer, which enhances the penetration and adhesion of the conductive polymer electrolyte, improving electrical performance by reducing delamination and minimizing ESR and leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive polymer electrolyte is applied to the anode, then low ESR and non-burning failure mode are achieved, but uniform penetration and coating of the anode pores is difficult, leading to delamination
Solution Approach 1:
A multi-layer adhesion coating is introduced as an intermediary between the dielectric and conductive polymer electrolyte. This coating includes a discontinuous precoat layer with nanoprojections that penetrate into the porous anode, and a resinous layer that provides a bonding interface for the conductive polymer, thereby improving both adhesion and uniformity of electrolyte distribution
Solution Approach 2:
The adhesion coating is constructed as a composite structure combining a discontinuous precoat layer containing metal oxide nanoprojections and a continuous resinous layer. This composite approach allows the nanoprojections to anchor into the anode pores while the resinous matrix provides uniform coverage and bonding, resolving the contradiction between penetration and uniform coating
2Reliability
If conductive polymer electrolyte is applied to achieve low ESR, then delamination occurs during mounting or use, but adding adhesion layers increases device complexity
Solution Approach 1:
The adhesion coating is segmented into two functional layers: a discontinuous precoat layer with nanoprojections for anchoring, and a continuous resinous layer for bonding. This segmentation allows each layer to perform its specific function optimally while maintaining overall structural simplicity
Solution Approach 2:
The precoat layer is designed to be discontinuous with localized nanoprojections that concentrate adhesion functionality at specific anchor points, while the resinous layer provides continuous coverage. This local quality approach improves adhesion without requiring a fully continuous complex structure throughout
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 design effectively improves capacitance and reduces ESR and leakage current, maintaining performance under various conditions by enhancing the adhesion and stability of the conductive polymer layer within the capacitor.
Implementation Method 1
pyrolytically converting the precursor to form a plurality of discrete nanoprojections of a manganese oxide
Implementation Method 2
adhesion coating that overlies the dielectric... improving the penetration and adhesion of the conductive polymer electrolyte
Data Source
AI summary
A solid electrolytic capacitor that contains an anode body, dielectric located over and/or within the anode body, an adhesion coating overlying the dielectric, and a solid electrolyte overlying the dielectric and adhesion coating that contains a conductive polymer. The adhesion coating is multi-layered and employs a resinous layer in combination with a discontinuous layer containing a plurality of discrete nanoprojections of a manganese oxide (e.g., manganese dioxide).