Solid Oxide Cell Electrode Paste Mixing for Uniform Particle Dispersion
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Solution Overview
Problem
Existing manufacturing methods for solid oxide cells face challenges in uniformly dispersing heterogeneous electron conductor and ion conductor particles, leading to suboptimal electrode layer performance.
Innovation Solution
A method involving separate dispersion processes for electron conductor and ion conductor particles using different solvents and mills, followed by sintering, to create a paste for the electrode layer with improved particle dispersion, allowing for a uniform reaction region and high efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electron conductor particles and ion conductor particles are mixed together for electrode layer manufacturing, then the electrode layer can be formed with both conductive functions, but the particles cannot be uniformly dispersed
Solution Approach 1:
The patent divides the electrode layer formation into two separate paste preparation steps: first paste containing electron conductor particles and second paste containing ion conductor particles. Each paste is prepared and dispersed separately before being combined, allowing optimized dispersion conditions for each particle type rather than attempting to disperse both simultaneously in a single mixture.
Solution Approach 2:
The patent introduces a binder as an intermediary substance that facilitates the combination of electron conductor particles and ion conductor particles. The binder serves as a medium that holds both particle types together while allowing each to maintain its own dispersion characteristics, enabling uniform distribution without direct particle-particle interaction that would cause aggregation.
2Manufacturing precision
If different dispersion processes are used for electron conductor and ion conductor particles, then particle dispersion is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent segments the dispersion process into two independent operations: first dispersion for electron conductor particles and second dispersion for ion conductor particles. Each dispersion operation can be optimized for its specific particle type using appropriate methods and parameters, achieving high dispersion quality without forcing a single-process solution that would compromise either particle type.
Solution Approach 2:
The patent allows different dispersion parameters (such as mixing time, speed, solvent type, and temperature) to be applied separately to each paste preparation step. By changing parameters independently for each particle type according to their specific requirements, the patent achieves optimal dispersion for both electron and ion conductors while maintaining flexibility in the manufacturing process.
3Manufacturing precision
If separate paste formation is used for electron conductor and ion conductor particles, then particle dispersion is enhanced, but the number of manufacturing steps increases
Solution Approach 1:
The patent segments paste formation into two separate steps, allowing each paste to be prepared with optimized conditions for its specific particle type. This segmentation enables better control over particle dispersion and paste consistency, which translates to improved electrode layer uniformity and reduced rework or defects that would slow production.
Solution Approach 2:
The patent merges the two separately prepared pastes (first paste with electron conductors and second paste with ion conductors) into a single combined paste for electrode layer formation. This merging step consolidates the manufacturing process after the beneficial separate preparation steps, allowing the electrode layer to be formed in one application step while retaining the dispersion advantages of separate paste preparation.
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 method enhances the dispersion of heterogeneous particles, resulting in improved performance and efficiency of solid oxide cells when used as fuel cells or water electrolysis cells by ensuring a uniform reaction region.
Implementation Method 1
the first dispersion operation is performed using a three-roll mill
Implementation Method 2
the second dispersion operation is performed by at least one of a bead mill, a sand mill, and a basket mill
Implementation Method 3
sintering the paste for the electrode layer
Data Source
AI summary
A manufacturing method of a solid oxide cell including a fuel electrode, an air electrode and an electrolyte disposed therebetween is disclosed. Forming at least one of the fuel electrode and the air electrode, includes forming a first paste including electron conductor particles and a first solvent, forming a second paste including ion conductor particles and a second solvent, forming a paste for an electrode layer by mixing the first paste and the second paste, and sintering the paste for the electrode layer.