Solid Electrolyte Pore Structure for Crack-Resistant Fuel Cells
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Solution Overview
Problem
Fuel cell stack devices face challenges in terms of durability, particularly due to issues such as cracking and peeling caused by heat expansion and shrinkage.
Innovation Solution
Incorporation of a solid electrolyte layer with a specific pore structure, comprising both first and second pores, which are strategically positioned to enhance durability by reducing the likelihood of cracks and peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte layer is used in fuel cell stack devices, then ion conductivity is improved, but cracking and peeling occur due to heat expansion and shrinkage, reducing durability
Solution Approach 1:
The solid electrolyte layer incorporates a controlled pore structure with specific pore sizes and distributions. These pores act as expansion buffers that accommodate thermal expansion and contraction stresses, preventing crack formation and peeling while maintaining the layer's structural integrity and ion conductivity throughout the fuel cell's operational life.
Solution Approach 2:
The solid electrolyte layer is designed as a composite structure combining electrolyte particles with a controlled pore network. This composite architecture provides both the necessary ion conductivity through the electrolyte material and mechanical flexibility through the pore structure, resolving the contradiction between durability and structural integrity under thermal cycling conditions.
2Reliability
If the solid electrolyte layer is made denser to improve ion conductivity, then ion transport efficiency increases, but thermal stress from expansion and shrinkage increases, causing cracking
Solution Approach 1:
Rather than making the layer completely dense, a controlled pore structure is introduced. The pores reduce thermal stress by providing expansion space, while the remaining electrolyte material maintains sufficient ion conductivity. The pore size and distribution are optimized to balance stress relief with ion transport efficiency.
3Strength
If the solid electrolyte layer is made more porous to reduce thermal stress, then resistance to cracking improves, but ion conductivity decreases
Solution Approach 1:
The pore structure is not uniformly distributed but strategically positioned within the solid electrolyte layer. Areas with higher stress concentrations have more pores for stress relief, while areas requiring high ion conductivity have fewer pores. This localized variation in pore density optimizes both crack resistance and ion conductivity in different regions of the layer.
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 improved pore structure in the solid electrolyte layer enhances the durability of the fuel cell stack devices, maintaining structural integrity under varying temperatures and improving ion conductivity.
Implementation Method 1
a solid electrolyte layer with a specific pore structure, comprising both first and second pores, which are strategically positioned to enhance durability by reducing the likelihood of cracks and peeling
Data Source
Figure 1A~1B
Figure 1C
Figure 2A~2B
AI summary
A solid electrolyte layer includes a plurality of electrolyte particles, each of the electrolyte particles containing an oxide, and a plurality of pores. The plurality of electrolyte particles includes a first particle and a second particle. The plurality of pores includes a first pore and a second pore. The first pore is in contact with the first particle. The second pore is inside the second particle.