Multicore-Shell Dielectric Grains for Reliable Multilayer Capacitors
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Solution Overview
Problem
Existing multilayer ceramic capacitors face challenges in maintaining reliability and dielectric constant under severe conditions due to grain size reduction and atomization, leading to IR degradation and capacitance loss.
Innovation Solution
Incorporating a multicore-shell structure in dielectric grains, where the grains have multiple cores surrounded by a high specific resistance shell, to maintain grain size and increase specific resistance, thereby preventing IR degradation and compensating for dielectric constant loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If grain size of barium titanate is reduced to increase withstand voltage, then voltage applied per grain increases, but dielectric constant decreases and IR degradation occurs
Solution Approach 1:
The dielectric grain is segmented into a core-shell structure where the core contains fine barium titanate particles for high withstand voltage, and the shell contains high specific resistance components to prevent IR degradation. This segmentation allows each part to fulfill its specific function while maintaining overall grain integrity.
Solution Approach 2:
The patent creates a composite dielectric grain structure combining barium titanate (for high voltage resistance) with high specific resistance components (for IR degradation prevention). The core-shell configuration forms a composite material that exhibits both high withstand voltage and high specific resistance properties simultaneously.
2Power
If grain size is reduced to increase voltage applied per grain, then capacitance increases, but dielectric constant decreases
Solution Approach 1:
Different regions of the dielectric grain are assigned different compositions and properties: the core region contains fine barium titanate particles optimized for high voltage application, while the shell region contains high specific resistance components. This local quality differentiation allows the grain to simultaneously achieve high voltage tolerance and maintain dielectric constant.
Data Source
AI summary
A multilayered capacitor including a capacitor body including a dielectric layer and internal electrodes, and an external electrode outside the capacitor body, wherein the dielectric layer includes a plurality of dielectric grains, at least one of the plurality of dielectric grains has a multicore-shell structure, and the dielectric grains having the multicore-shell structure include two or more dielectric cores and shells surrounding at least some of the cores.