Electrolyte Membrane for Solid Oxide Fuel Cell
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Solution Overview
Problem
The existing methods for manufacturing solid oxide fuel cells face challenges in achieving optimal contact area and low sheet resistance between the electrolyte membrane and electrodes, leading to inefficient oxygen ion exchange and increased interface resistance.
Innovation Solution
A method involving the formation of an electrolyte membrane using oxygen ion-conductive first inorganic particles and an electrospinning layer with a high content of oxygen ion-conductive second inorganic particles, where the second inorganic particles comprise 30wt% to 40wt% of the electrospinning composition, to enhance oxygen ion conductivity and reduce sheet resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional electrolyte membrane structure is used, then the manufacturing process is simple, but the contact area with electrodes is insufficient and sheet resistance is high
Solution Approach 1:
The patent applies porous electrospun nanofiber membranes as the electrolyte membrane structure. The porous structure provides high surface area and contact area with electrodes while maintaining ion conductivity. The nanofiber network creates numerous pathways for oxygen ion transport and enhances interfacial contact between the electrolyte membrane and electrode materials, thereby reducing sheet resistance without significantly complicating the manufacturing process.
Solution Approach 2:
The patent employs thin film electrospun nanofiber membranes as the electrolyte layer. These thin films provide large surface area-to-volume ratio, enabling enhanced contact area with electrodes. The thin film structure reduces overall membrane thickness, which lowers sheet resistance and improves ion transport efficiency while maintaining structural integrity through the nanofiber network.
2Reliability
If the electrolyte membrane has thick structure, then mechanical strength is sufficient, but oxygen ion exchange efficiency is reduced
Solution Approach 1:
The porous nanofiber structure allows the membrane to maintain mechanical strength through the interconnected fiber network while providing numerous pathways for oxygen ion transport. The porosity enables ions to move through the membrane thickness more efficiently, reducing the effective diffusion path length and enhancing oxygen ion exchange efficiency without sacrificing structural integrity.
Solution Approach 2:
The patent transitions from a dense 2D membrane structure to a 3D nanofiber network structure. This dimensional change creates a hierarchical pore structure with interconnected channels throughout the membrane thickness, providing multiple parallel pathways for ion transport. The 3D architecture enhances mechanical strength through fiber entanglement while simultaneously improving ion exchange efficiency through increased transport pathways.
3Reliability
If the interface between electrolyte membrane and electrode is poor, then manufacturing is easier, but interface resistance is high
Solution Approach 1:
The porous nanofiber structure of the electrolyte membrane enables intimate contact with electrode particles, creating extensive interfacial contact areas. The porous network allows electrode materials to penetrate and interact with the membrane structure, forming strong mechanical and electrical interfaces. This enhances interface quality and reduces contact resistance while maintaining compatibility with conventional electrode fabrication processes.
Solution Approach 2:
The patent creates a composite structure where the electrospun nanofiber membrane (containing electrolyte material and binder) interfaces with electrode materials. This composite architecture ensures good interfacial adhesion and electrical contact between the electrolyte and electrode, reducing interface resistance. The composite structure integrates the benefits of both materials while facilitating efficient charge transfer at the interface.
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 approach increases the contact area with electrodes, maximizes oxygen ion exchange, and maintains low sheet resistance, thereby improving the performance of solid oxide fuel cells by optimizing the interface between the electrolyte membrane and electrodes.
Implementation Method 1
forming an electrospinning layer on at least one surface of the electrolyte membrane using a composition for electrospinning
Implementation Method 2
an electrolyte membrane using an electrolyte membrane composition including first inorganic particles having oxygen ion conductivity; and forming an electrospinning layer on at least one surface of the electrolyte membrane using a composition for electrospinning including second inorganic particles having oxygen ion conductivity
Data Source
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AI summary
The present specification relates to a method for manufacturing an electrolyte membrane for a solid oxide fuel cell, an electrolyte membrane for a solid oxide fuel cell, a solid oxide fuel cell including the electrolyte membrane, and a fuel cell module including the solid oxide fuel cell.