Ni-Sn Conductive Powder with Graphene Barrier for MLCC Internal Electrodes

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Solution Overview

Problem

Multilayer capacitors with Sn additives in internal electrodes face a capacitance reduction issue due to Sn diffusion into dielectric layers, affecting reliability and performance.

Innovation Solution

Incorporating a conductive powder particle with a Ni-Sn alloy and a graphene layer at the boundary, where the Sn content gradient is controlled to prevent diffusion, ensuring a stable Sn distribution within the particle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If Sn is added to internal electrodes to improve reliability, then high temperature load life is improved, but Sn diffuses from the internal electrode to the dielectric layer causing capacitance reduction

Engineering Contradiction:

Improvehigh temperature load lifeVSAvoidcapacitance

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The internal electrode is segmented into multiple regions with different Sn content. The particle structure is divided into a first region (core) with lower Sn content and a second region (outer layer) with higher Sn content, creating a gradient distribution that prevents Sn diffusion while maintaining reliability benefits

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the internal electrode particle are given different Sn content characteristics. The core region has lower Sn content to prevent diffusion, while the outer region has higher Sn content to provide reliability improvement, creating localized functional zones within the same particle

Inventive Principle:

Principle #3Local quality

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 effectively prevents Sn diffusion into dielectric layers, maintaining capacitance and enhancing the reliability of multilayer capacitors by trapping Sn within the particles, thus improving high-temperature load life and reducing capacitance loss.

Implementation Method 1

graphene formed to surround at least a portion of a surface of the coating layer

Methodology Applied

Scientific EffectDiffusion barrier: Diffusion Barrier

Data Source

PatentUS11569039B2Conductive powder particle for internal electrode and electronic component, and manufacturing method thereof

Publication Date: 2023.01.31 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

An electronic component includes a body including a plurality of stacked dielectric layers and internal electrodes disposed with a corresponding dielectric layer interposed therebetween, and external electrodes disposed on the body and connected to corresponding internal electrodes. One of the internal electrodes includes a particle including Ni and Sn and a graphene layer disposed at a boundary of the particle. A ratio of an Sn content to a total content of Ni and Sn is Sn/(Ni+Sn), Sn/(Ni+Sn) of a first region located inside the particle at a first distance from a boundary between the particle and the graphene layer is A1, Sn/(Ni+Sn) of a second region located inside the particle at a second distance from a boundary between the particle and the graphene layer is A2, the second distance is smaller than the first distance, and A1 is smaller than A2.