MLCC Internal Electrode Composition for Thin-Layer Connectivity
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Solution Overview
Problem
The miniaturization and high capacitance of multilayer ceramic capacitors are hindered by issues such as disconnected internal electrodes and reduced connectivity, which occur when dielectric layers and internal electrodes are thinly formed.
Innovation Solution
Incorporating internal electrodes made of Ni and an oxide including Al, with a content of Al ranging from 3 to 5 at % relative to Ni, to improve connectivity and maintain reliability, even at reduced thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of internal electrodes is reduced to achieve miniaturization and high capacitance, then the size of the multilayer ceramic capacitor is reduced and capacitance per unit volume increases, but the connectivity of internal electrodes deteriorates and disconnected regions occur
Solution Approach 1:
The patent changes the material composition parameters of internal electrodes by incorporating Al oxide particles (0.1-10 wt%) into the Ni-based internal electrode material. This parameter change allows the electrodes to maintain connectivity and electrical performance even when thickness is reduced for miniaturization, resolving the contradiction between size reduction and connectivity maintenance.
Solution Approach 2:
The patent creates a composite internal electrode material by combining Ni powder with Al oxide particles. This composite structure provides both the electrical conductivity needed for connectivity and the mechanical strength required to prevent disconnection during firing, enabling miniaturization without sacrificing electrode connectivity.
2Volume of moving object
If the thickness of dielectric layers and internal electrodes is reduced to achieve miniaturization, then the capacitance per unit volume increases, but the breakdown voltage characteristics deteriorate
Solution Approach 1:
The patent modifies the internal electrode material composition by adding Al oxide particles, which changes the electrical and mechanical properties of the electrode. This parameter change enables the maintenance of breakdown voltage characteristics even when the overall component size and layer thickness are reduced for miniaturization.
Solution Approach 2:
By creating a composite internal electrode material consisting of Ni and Al oxide particles, the patent achieves both high electrical conductivity for capacitance and enhanced mechanical strength for breakdown voltage resistance, allowing miniaturization without compromising electrical performance.
3Reliability
If the content of Al oxide in internal electrodes is increased to improve connectivity, then electrode connectivity is enhanced, but the electrical conductivity may be reduced
Solution Approach 1:
The patent optimizes the Al oxide content parameter within a specific range (0.1-10 wt%, preferably 0.5-5 wt%). This controlled parameter change ensures sufficient connectivity improvement while maintaining adequate electrical conductivity, balancing both requirements through precise compositional control.
Solution Approach 2:
The Al oxide particles are distributed throughout the internal electrode material to provide localized strength and connectivity enhancement, while the Ni matrix maintains overall electrical conductivity. This local quality approach allows different regions of the electrode material to fulfill different functions.
Data Source
AI summary
A multilayer electronic component includes a body including a dielectric layer and internal electrodes alternately disposed with the dielectric layer and external electrodes disposed on the body, wherein the internal electrodes include Ni and oxide including Al, and a content of Al is 3 at % or more and 5 at % or less compared to the Ni.