Multilayer Ceramic Capacitor Electrode Segmentation for Delamination
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Solution Overview
Problem
Multilayer ceramic capacitors face delamination issues due to differences in compression and expansion between inner electrode layers and dielectric layers, which can lead to a reduction in capacitance and structural defects.
Innovation Solution
The capacitors incorporate first and second inner electrode layers with irregular regions of varying coverage on the dielectric layers, dispersing the difference in compression and expansion and promoting adhesion between layers to prevent delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the continuity of the inner electrode layers is enhanced by increasing the coverage, then the capacitance is increased, but the multilayer ceramic capacitor becomes prone to delamination
Solution Approach 1:
The patent applies local quality by creating two distinct regions within the inner electrode layers: a first region with high coverage (greater than 50%) to increase capacitance, and a second region with low coverage (50% or less) to prevent delamination. This spatial variation in coverage quality allows the same electrode layer to simultaneously achieve both high capacitance and delamination resistance in different areas.
2Area of stationary object
If the coverage of inner electrode layers to dielectric layers is increased, then the opposing area is increased, but the difference in compression and expansion between layers causes delamination
Solution Approach 1:
The patent segments the inner electrode layers into two functional zones: a first region occupying 5-80% of the area with high coverage for maximizing opposing area and capacitance, and a second region with low coverage for maintaining layer adhesion. This segmentation allows the electrode structure to simultaneously achieve large opposing area while preserving structural stability through the adhesive second region.
Data Source
AI summary
A multilayer ceramic capacitor includes a laminate including a plurality of dielectric layers laminated one on the other, the laminate being in a cuboid or substantially cuboid shape. The multilayer ceramic capacitor includes external electrodes on the end surfaces of the laminate. A first inner electrode layer exposed through the first end surface and a second inner electrode layer exposed through the second end surface are provided on the dielectric layer. A first region and a second region are defined in the first inner electrode layer and the second inner electrode layer, in which coverages of the first inner electrode layer and the second inner electrode layer to the dielectric layer are greater in the first region than in the second region.