Multilayer Capacitor Composition for Capacitance and Withstand Voltage
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Solution Overview
Problem
Multilayer capacitors face challenges in achieving balanced performance in terms of withstand voltage, reliability, and miniaturization, with existing designs often compromising on one aspect to enhance another.
Innovation Solution
The multilayer capacitor design incorporates a laminate structure with varying molar contents of elements like Dy, Tb, Y, Sm, Ho, Gd, Er, Ce, La, and Nd in the capacitance formation region and higher contents of Sn, Mg, and Al in the margin region, along with a BaTiO3-based main component, to optimize capacitance, reliability, and withstand voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the molar content of rare earth elements (Dy, Tb, Y, Sm, Ho, Gd, Er, Ce, La, Nd) is increased in the capacitance formation region, then capacitance and reliability are improved, but manufacturing complexity increases due to regional composition control
Solution Approach 1:
The patent applies local quality by creating distinct compositional regions within the dielectric layer: the capacitance formation region contains higher molar content of rare earth elements (Dy, Tb, Y, Sm, Ho, Gd, Er, Ce, La, Nd) to optimize capacitance, while the margin region contains higher molar content of Sn, Mg, and Al to enhance reliability and reduce defects. This spatial differentiation of material composition allows each region to perform its specific function optimally without compromising the other.
2Reliability
If the grain size of dielectric is reduced in the margin region, then reliability and withstand voltage are improved, but capacitance formation efficiency decreases
Solution Approach 1:
The patent implements local quality by controlling grain size differently in different regions: the margin region has shorter grain size (within 2 μm from the boundary toward the surface) to improve reliability and withstand voltage by reducing defect density and preventing crack propagation, while the capacitance formation region maintains larger grain size to ensure efficient capacitance formation and optimal dielectric performance.
3Strength
If higher molar content of Sn, Mg, and Al is added to the margin region, then withstand voltage and reliability are enhanced, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the molar content of accessory components across different regions: Sn, Mg, and Al concentrations are increased in the margin region to enhance withstand voltage and mechanical strength, while rare earth element concentrations are increased in the capacitance formation region. This controlled parameter variation optimizes both electrical and mechanical properties without requiring fundamentally new materials.
Solution Approach 2:
The patent employs composite materials by combining multiple accessory components (Sn, Mg, Al, and rare earth elements) with the BaTiO3-based main component in region-specific ratios. The margin region composite, enriched with Sn, Mg, and Al, provides enhanced reliability and defect resistance, while the capacitance formation region composite, enriched with rare earth elements, provides optimal capacitance performance.
Data Source
AI summary
A multilayer capacitor includes a body including a laminate structure in which at least one first internal electrode and at least one second internal electrode are alternately stacked in a first direction with at least one dielectric layer therebetween, and first and second external electrodes spaced apart on the body, to be connected to at least one first internal electrode and at least one second internal electrode, respectively. The body includes, in a larger molar content, at least one selected from the group consisting of Dy, Tb, Y, Sm, Ho, Gd, Er, Ce, La and Nd in a capacitance formation region including a region between at least one first internal electrode and at least one second internal electrode than in a margin region including a region between a boundary line of at least one first internal electrode and at least one second internal electrode and a surface of the body.