Multilayer Capacitor MAX-Phase Co-Material for Higher Capacitance
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Solution Overview
Problem
Existing multilayered capacitors face challenges in achieving high capacitance and electrode connectivity due to the use of barium titanate-based materials, which can reduce layer density and increase dielectric layer thickness when nano-sized barium titanite is added, leading to decreased capacitance.
Innovation Solution
Incorporation of a co-material represented by Chemical Formula Mn+1AXn, where M includes Ti, Zr, Hf, Sc, Cr, V, Nb, Ta, Mo, Mn, and combinations thereof, A includes Group 11 to Group 16 elements, X includes C or N, and n is 1 to 4, in the internal electrodes, dielectric layer, or their interface, to enhance connectivity and capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If nano-sized barium titanite co-material is added to internal electrodes, then heat shrinkage temperature difference between dielectric layer and internal electrodes is reduced, but layer density of internal electrodes decreases and dielectric layer thickness increases, leading to reduced capacitance
Solution Approach 1:
The patent changes the material parameters by replacing traditional barium titanite co-material with MAX phase co-material (Mn+1AXn), which has different thermal and physical properties. This parameter change allows reducing heat shrinkage temperature difference while avoiding the side effect of increased dielectric layer thickness, thereby maintaining high capacitance
Solution Approach 2:
The patent uses composite materials by incorporating MAX phase co-material (containing elements like Ti, Zr, Hf combined with Group 11-16 elements and C or N) into the internal electrode structure. This composite approach provides both thermal compatibility and maintains electrode density, resolving the contradiction between heat shrinkage stability and capacitance
2Reliability
If content of barium titanite co-material is increased to improve electrode connectivity, then connectivity is enhanced, but dielectric layer thickness increases due to material diffusion, reducing capacitance
Solution Approach 1:
The patent changes the material composition parameter by using MAX phase co-material instead of barium titanite, which has controlled diffusion characteristics during sintering. This allows achieving good electrode connectivity without excessive material diffusion into the dielectric layer, thus preventing capacitance reduction
Solution Approach 2:
The MAX phase co-material acts as an intermediary substance that facilitates electrode connectivity while having controlled interaction with the dielectric layer. Its unique structure (Mn+1AXn) provides a buffer effect during sintering, preventing excessive diffusion that would otherwise increase dielectric layer thickness and reduce capacitance
Data Source
AI summary
A multilayered capacitor according to an embodiment includes a capacitor body including a dielectric layer including a barium titanate-based compound as a main component; and an internal electrode including a conductive metal, and an external electrode outside the capacitor body,wherein the internal electrode, an interface between the dielectric layer and the internal electrode, or all of them includes a co-material represented by Chemical Formula 1.