Solid Oxide Membrane Electrode Assembly Co-Sintering
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Solution Overview
Problem
Existing methods for producing solid state electrochemical cells require multiple steps and high thermal energy due to the use of different sintering temperatures for electrodes operating in oxidizing and reducing conditions, leading to inefficiencies and potential reactions that degrade device performance.
Innovation Solution
A process for simultaneously sintering a supporting electrode, membrane, and second electrode layers using composite mixed metal oxides with similar sintering behavior, allowing for a single sintering step and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sintering steps are used for different layers, then adhesion and densification are improved, but processing time and energy consumption increase
Solution Approach 1:
The patent combines multiple sintering operations into a single simultaneous sintering step where the electrolyte layer and electrode layers are sintered together at the same temperature. This merging of processes reduces total processing time while maintaining adhesion between layers through co-sintering, eliminating the need for separate sintering steps that would require additional heating cycles and handling.
Solution Approach 2:
The invention changes the sintering parameters by using electrode layers with compositions that have sintering characteristics matching the electrolyte layer. By selecting electrode materials with similar sintering temperatures and behaviors, the system enables single-step sintering while achieving proper densification and adhesion that would otherwise require multiple steps with different temperature profiles.
2Manufacturing precision
If multiple sintering steps are used for different layers, then densification is improved, but energy consumption increases
Solution Approach 1:
The patent merges multiple energy-intensive sintering operations into a single simultaneous sintering process. By co-sintering the electrolyte and electrode layers together at one optimized temperature, the total thermal energy required is reduced compared to performing separate sintering steps, while still achieving the necessary densification of all layers through the combined thermal process.
3Reliability
If different sintering temperatures are used for electrodes, then electrode performance is improved, but device complexity increases
Solution Approach 1:
The invention changes the material parameters by selecting electrode compositions whose sintering characteristics match those of the electrolyte layer. This parameter matching enables all layers to be processed at a single temperature, simplifying the manufacturing process while maintaining the performance requirements that would otherwise necessitate different sintering temperatures for optimized electrode functionality.
4Strength
If electrolyte layer is made thick for structural support, then mechanical strength is improved, but ion transport efficiency decreases
Solution Approach 1:
The patent employs composite electrode materials containing nickel oxide and metal oxides that provide both structural integrity and functional performance. The electrode-supported configuration uses these composite materials to create a mechanically strong supporting structure that can maintain adequate thickness while the co-sintering process ensures proper densification and adhesion, allowing the system to balance mechanical strength requirements with ion transport efficiency through optimized material composition rather than simply increasing layer thickness.
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
This method significantly reduces processing time and energy usage while ensuring adhesion between layers, maintaining device performance by using electrodes with the same composition under reducing conditions.
Implementation Method 1
the production of each layer of the MEA requires the use of thermal energy to remove organic binders, densify the layer and promote adhesion to the neighbouring component. This energy is typically applied by the use of high temperatures (>1300 °C) for a suitable period of time
Data Source
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AI summary
A process for the preparation of a membrane electrode assembly comprising providing, in the following layer order, (I) a green supporting electrode layer comprising a composite of a mixed metal oxide and Ni oxide; (IV) a green mixed metal oxide membrane layer; and (V) a green second electrode layer comprising a composite of a mixed metal oxide and Ni oxide; and sintering all three layers simultaneously.