Multilayer Capacitor Electrode Barrier for Capacity Retention
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Solution Overview
Problem
The challenge in manufacturing multilayered capacitors is the reduction in capacity due to the increased thickness of the dielectric layer caused by the diffusion of barium titanite co-material during sintering, which decreases the layer density of internal electrodes.
Innovation Solution
Incorporating a metal oxide layer between the dielectric layer and internal electrodes, using a compound represented by Chemical Formula 1, such as Ti2AlC, to enhance electrode connectivity and stability, and employing a sacrificial metal to form a metal oxide layer that prevents oxidation of the MAX phase compound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the content of barium titanite co-material in internal electrodes is increased to reduce heat shrinkage temperature difference, then the heat shrinkage temperature difference is reduced, but the layer density of internal electrodes decreases and the dielectric layer thickness increases, reducing capacitor capacity
Solution Approach 1:
The patent introduces a metal oxide layer as an intermediary between the internal electrode and dielectric layer. This metal oxide layer acts as a barrier that prevents the diffusion of barium titanite co-material into the dielectric layer during sintering, thereby resolving the contradiction by allowing the use of barium titanite for heat shrinkage control without the harmful diffusion effect that reduces capacity
Solution Approach 2:
The patent uses a composite structure consisting of the internal electrode containing barium titanite co-material, the metal oxide layer, and the dielectric layer. This composite material approach allows the internal electrode to have the desired heat shrinkage properties while the metal oxide layer prevents unwanted diffusion, thus maintaining both heat stability and capacitor capacity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves electrode connectivity and maintains electrical characteristics by preventing decomposition of the MAX phase compound, thereby maintaining capacitor capacity and performance.
Implementation Method 1
employing a sacrificial metal to form a metal oxide layer that prevents oxidation of the MAX phase compound
Implementation Method 2
the internal electrodes are manufactured by adopting a method of adding a nano-sized barium titanite (BaTiO3) co-material
Data Source
AI summary
The multilayered capacitor according to the present disclosure includes a capacitor body including a dielectric layer; an internal electrode; and a metal oxide layer disposed between the dielectric layer and the internal electrode, and an external electrode disposed outside the capacitor body,wherein the internal electrode includes a compound represented by Chemical Formula 1.