Multilayer Ceramic Capacitor Electrode Coverage for Adhesion and Contact
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Solution Overview
Problem
Multilayer ceramic capacitors face reliability issues due to decreased adhesion between internal electrode layers and dielectric layers when the coverage of internal electrode layers is increased, leading to potential peeling and reduced connectivity with external electrodes.
Innovation Solution
The design incorporates internal electrode layers with regions of varying coverage, where a higher coverage region connects to external electrodes and lower coverage regions enhance adhesion with dielectric layers, maintaining both connectivity and adhesion without sacrificing capacitance generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coverage of internal electrode layers is increased to improve contact property with external electrodes, then the area connected to external electrodes increases and ESR is suppressed, but the adhesion between internal electrode layers and dielectric layers decreases leading to peeling
Solution Approach 1:
The internal electrode layers are designed with non-uniform coverage distribution, where the first region has larger coverage for better contact with external electrodes and the second region has smaller coverage for stronger adhesion with dielectric layers. This local variation in coverage resolves the contradiction between contact property and adhesion strength.
2Reliability
If the coverage of internal electrode layers is increased to reduce Equivalent Series Resistance, then the electrical connectivity improves, but the structural integrity decreases due to peeling at bonded portions
Solution Approach 1:
Different regions of the internal electrode layers have different coverage levels optimized for their specific functions: the first region with larger coverage optimizes electrical connectivity to external electrodes, while the second region with smaller coverage maintains structural integrity through strong adhesion with dielectric layers.
3Quantity of substance
If the coverage of internal electrode layers is increased to improve contact area, then the capacitance generation capability increases, but the adhesion between layers decreases causing peeling defects
Solution Approach 1:
The internal electrode layers implement spatially varying coverage where the first region provides larger contact area for capacitance generation and external electrode connection, while the second region provides smaller coverage to maintain strong adhesion and prevent peeling defects at the dielectric layer interfaces.
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including dielectric layers and internal electrode layers that are laminated, first and second main surfaces opposed to each other in a lamination direction, first and second lateral surfaces opposed to each other in a width direction orthogonal or substantially orthogonal to the lamination direction, and first and second end surfaces opposed to each other in a length direction orthogonal or substantially orthogonal to the lamination direction and the width direction. The multilayer body further includes external electrodes that are respectively provided on the first end surface and the second end surface and connected to the internal electrode layers. The internal electrode layers each include first and second regions respectively including different coverages. The first region includes a larger coverage than the second region. The first region is connected to a corresponding one of the external electrodes.