MLCC External Electrodes Graphene Coated Metal Powder
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Solution Overview
Problem
Multilayer ceramic capacitors (MLCCs) face issues with non-uniform external electrode thickness, increased resistance, and reduced reliability due to permeation of plating solutions, which affect moisture resistance and equivalent series resistance (ESR).
Innovation Solution
A capacitor component design featuring a body with dielectric layers and internal electrodes, connected by metal powder particles with graphene or carbon nanotube coatings on external electrodes, improving conductivity and reducing ESR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a paste including conductive metal is used to form external electrodes by dipping, then the external electrodes can be formed on the body, but the thickness of the external electrode becomes non-uniform and is excessively reduced on corners
Solution Approach 1:
The patent changes the material parameters of the external electrode from conventional metal paste to metal powder particles coated with graphene or carbon nanotubes. This material parameter change enables the external electrode to maintain uniform thickness while being formed by dipping, as the coated particles provide better flow and distribution characteristics that prevent corner thinning.
2Manufacturing precision
If the external electrode is divided into primary and secondary external electrodes with primary formed by transcribing, then the thickness uniformity is improved, but the contact area between internal electrode and external electrode is reduced which increases resistance and ESR
Solution Approach 1:
The patent uses metal powder particles coated with graphene or carbon nanotubes as the external electrode material. This composite material provides both the manufacturing advantages of uniform thickness formation and the electrical performance of low resistance, eliminating the need to divide the electrode into primary and secondary regions.
Solution Approach 2:
The patent changes the material composition and surface properties of the external electrode by using coated metal powder particles. This parameter change allows the external electrode to achieve uniform thickness through simple dipping while maintaining large contact area with the internal electrode, thus avoiding increased resistance.
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 design enhances moisture resistance and reduces ESR, maintaining capacitance while preventing chipping defects and ensuring uniform external electrode thickness, thus improving the reliability and performance of MLCCs.
Implementation Method 1
The first and second external electrodes include metal powder particles, a surface of each of which is coated with at least one of graphene and carbon nanotubes
Implementation Method 2
The first and second external electrodes include metal powder particles, a surface of each of which is coated with at least one of graphene and carbon nanotubes
Implementation Method 3
resistance and ESR may increase
Data Source
AI summary
A capacitor component includes a body including a dielectric layer, a layering portion in which first and second internal electrodes opposing each other are layered in a first direction, and first and second connecting portions disposed on both surfaces of the layering portion taken in a second direction perpendicular to the first direction and connected to the first and second internal electrodes, respectively; and first and second external electrodes disposed on the first and second connecting portions, respectively, and the first and second external electrodes include metal powder particles, a surface of each of which is coated with at least one of graphene and carbon nanotubes.