Multilayer Ceramic Capacitor Electrodes with Nickel Copper Barium Titanate
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Solution Overview
Problem
Multilayer ceramic capacitors face the challenge of reducing equivalent series resistance (ESR) to prevent the Big-V phenomenon, which causes voltage noise, while maintaining low equivalent series inductance (ESL) and high capacitance, especially in ultra-miniaturized electronic components.
Innovation Solution
The use of internal electrodes composed of 80 to 99.98 wt % nickel (Ni), 0.01 to 10 wt % copper (Cu), and 0.01 to 10 wt % barium titanate (BaTiO3) in multilayer ceramic capacitors, which are alternately exposed through the ceramic element's end surfaces, increases equivalent series resistance (ESR) without increasing equivalent series inductance (ESL), thereby reducing voltage noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If equivalent series resistance (ESR) is reduced to prevent Big-V phenomenon, then voltage noise is reduced, but equivalent series inductance (ESL) cannot be maintained low and capacitance decreases
Solution Approach 1:
The patent changes the material composition parameters of the internal electrode by adding copper (0.01-10 wt%) and barium titanate (0.01-10 wt%) to nickel (80-99.98 wt%). This compositional parameter change modifies the electrical properties to achieve increased ESR while maintaining low ESL, resolving the contradiction between preventing Big-V phenomenon and maintaining capacitance.
Solution Approach 2:
The patent uses a composite material composition for the internal electrode consisting of nickel, copper, and barium titanate. This composite approach allows the electrode to exhibit combined properties: nickel provides base conductivity, copper enhances conductivity control, and barium titanate contributes to dielectric properties, collectively achieving the desired ESR and ESL characteristics while maintaining capacitance.
2Reliability
If equivalent series inductance (ESL) is reduced to lower impedance, then capacitance increases, but equivalent series resistance (ESR) decreases causing Big-V phenomenon
Solution Approach 1:
The patent modifies the electrical resistance parameter of the internal electrode through controlled addition of copper and barium titanate to nickel. This parameter change enables simultaneous achievement of low ESL (for low impedance) and appropriate ESR (to prevent Big-V phenomenon), as the composite composition allows independent optimization of these electrical properties.
Solution Approach 2:
The patent converts the typically harmful effect of high ESR (which degrades capacitor performance) into a beneficial feature by precisely controlling ESR through material composition. The added copper and barium titanate, which would normally increase resistance, are used in controlled amounts to achieve optimal ESR that prevents Big-V phenomenon while maintaining low ESL, thus converting resistance from a harmful factor to a controllable parameter that benefits overall performance.
3Volume of moving object
If internal electrodes are made thinner for ultra-miniaturization, then product size decreases, but manufacturing precision and electrode integrity become difficult to maintain
Solution Approach 1:
The patent uses composite material composition (nickel with copper and barium titanate) to enhance the mechanical and electrical properties of thin internal electrodes. This composite structure provides improved integrity and conductivity in thinner electrode layers, enabling ultra-miniaturization while maintaining manufacturing precision and electrode functionality.
Solution Approach 2:
The patent optimizes the compositional parameters of the internal electrode material to achieve better forming characteristics for thin layers. The specific ratios of nickel (80-99.98 wt%), copper (0.01-10 wt%), and barium titanate (0.01-10 wt%) are selected to improve sintering behavior and electrode integrity, enabling successful manufacturing of ultra-thin electrodes in miniaturized capacitors.
Data Source
AI summary
There is provided a multilayer ceramic electronic component, including: a ceramic element having a plurality of dielectric layers laminated therein; and first and second internal electrodes formed within the ceramic element, wherein the first and second internal electrodes include 80 to 99.98 wt % of nickel (Ni), 0.01 to 10 wt % of copper (Cu), and 0.01 to 10 wt % of barium titanate (BaTiO3).