Perovskite Electrolyte-Anode Structure for Fuel Cell Warpage Control
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Solution Overview
Problem
The electrolyte layer-anode composite member in fuel cells experiences warpage and residual stress due to differences in thermal expansion coefficients between the solid electrolyte and anode, leading to decreased power generation performance and potential breakage.
Innovation Solution
The composite member is designed with an anode having a thickness of 850 µm or more and a solid electrolyte layer with a perovskite crystal structure, where the anode and electrolyte layer are stacked, controlling the thickness ratio to suppress warpage and residual stress, and the anode includes nickel or nickel compounds for improved proton conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the thickness of the anode is increased to suppress warpage, then the structural stability is improved, but the gas diffusivity deteriorates
Solution Approach 1:
The invention changes the thickness parameter of the anode to 850 µm or more, which suppresses warpage caused by thermal expansion differences during co-sintering. This parameter optimization balances structural stability with acceptable gas diffusivity, resolving the contradiction between thickness requirements for stability and requirements for gas transport.
2Manufacturing precision
If the thermal expansion coefficient of the solid electrolyte is controlled to match the anode, then the warpage is reduced, but the manufacturing complexity increases
Solution Approach 1:
The invention controls the thermal expansion coefficient of the solid electrolyte to be within ±2×10^-6/K of the anode's thermal expansion coefficient. This parameter matching approach reduces warpage during co-sintering while maintaining relatively simple manufacturing processes, as it involves selecting materials with appropriate thermal properties rather than complex manufacturing steps.
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 configuration reduces warpage and residual stress, enhancing the power generation performance of the fuel cell by maintaining structural integrity and improving gas diffusivity.
Implementation Method 1
a composite member made of the solid electrolyte layer and the anode is obtained, for example, by shaping a precursor of the anode, then applying a solid electrolyte to a surface thereof, and performing co-sintering
Implementation Method 2
The electrolyte layer-anode composite member may have warpage, due to a difference in expansion coefficient between a precursor of the solid electrolyte layer and the precursor of the anode in the co-sintering step
Data Source
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AI summary
An electrolyte layer-anode composite member includes an anode including a first metal oxide having a perovskite crystal structure, and a solid electrolyte layer including a second metal oxide having a perovskite crystal structure, the anode including at least one of nickel and a nickel compound, the anode having a sheet-like shape, the solid electrolyte layer having a sheet-like shape, the solid electrolyte layer being stacked on the anode, the anode having a thickness Ta of 850 µm or more. The thickness Ta of the anode and a thickness Te of the solid electrolyte layer may satisfy a relation of 0.003≤Te/Ta≤0.036. The thickness Ta of the anode and a diameter Da of the anode may satisfy a relation of 55≤Ta/Da≤300.