Multi-layered Ceramic Capacitor Notch Electrodes Step Absorption
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Solution Overview
Problem
Multi-layered ceramic capacitors face interlayer interface defects due to insufficient adhesion between dielectric and internal electrode layers, which limits their high capacitance and reliability, especially in applications requiring increased laminated layers.
Innovation Solution
The design incorporates notch portions in internal electrodes and step absorption layers in the ceramic body to reduce exposed electrode area and enhance bonding, with notch width adjusted between 20% to 80% of the electrode width, and step absorption layers applied in margin portions to improve interfacial bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of laminated layers of the dielectric layer and the internal electrode layer is increased to achieve high capacitance, then the capacitance increases, but interlayer interface defects occur due to insufficient interlayer adhesion
Solution Approach 1:
The patent applies different structural treatments to different regions of the internal electrode. Notch portions are formed at both ends of the internal electrode to reduce the exposed area, while the intermediate portion maintains full width for electrical connection. This local differentiation resolves the contradiction by improving adhesion at critical interfaces without compromising overall capacitance.
Solution Approach 2:
The internal electrode is segmented into different regions with different widths. The notch portions create a stepped structure where the electrode width varies along its length. This segmentation reduces the exposed surface area at layer interfaces, improving adhesion while maintaining the necessary electrical connectivity through the wider intermediate portion.
2Reliability
If the exposed area of the internal electrode is reduced to improve interlayer adhesion, then delamination and cracking failures decrease, but the electrical connection and capacitance may be compromised
Solution Approach 1:
The internal electrode is designed with local quality variations: narrow notch portions at the ends for improved adhesion, and a wider intermediate portion for maintaining electrical connection. This local differentiation allows the electrode to simultaneously achieve both good adhesion and sufficient capacitance.
Solution Approach 2:
The electrode is segmented into functional zones: the notch portions (reduced width) handle the adhesion requirement, while the intermediate portion (full width) handles the electrical connection and capacitance requirement. This segmentation allows each zone to optimize for its specific function without compromising the other.
Data Source
AI summary
A multi-layered ceramic electronic component includes: a ceramic body including a dielectric layer and first and second internal electrodes disposed to oppose each other with the dielectric layer interposed therebetween; and first and second external electrodes disposed outside of the ceramic body and electrically connected to the first and second internal electrodes, respectively. The first internal electrode is exposed from a first surface of the ceramic body and the second internal electrode is exposed from a second surface opposing the first surface. The first internal electrode has a notch portion disposed inwardly of a portion facing the first surface and, and the second internal electrode has a notch portion disposed inwardly of a portion facing the second surface. Each of the notch portions and a margin portion of the ceramic body in a second direction and in a third direction are provided with a step absorption layer, respectively.