Co-sintering Large-Area Thin Film SOFC Anode Supports
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Solution Overview
Problem
Conventional manufacturing processes for solid oxide fuel cells involve a two-step firing process, leading to extended process time and increased costs due to the distinct firing temperatures of the electrolyte and cathode, which complicates the production of large-area thin film solid oxide fuel cells.
Innovation Solution
A method involving the preparation of anode support, anode functional layer, and electrolyte slurries for tape casting, followed by stacking and hot press, warm iso-static press (WIP), and co-sintering to create a laminated body, simplifying the process into a single step and allowing precise control over layer thickness and interfacial adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a two-step firing process is used to manufacture solid oxide fuel cells with distinct firing temperatures for electrolyte and cathode, then the manufacturing precision of each layer is improved, but the productivity is reduced due to extended process time
Solution Approach 1:
The patent combines the separate firing processes for the electrolyte and cathode into a single co-sintering step. The electrolyte and cathode materials are formulated with compatible sintering characteristics, allowing both layers to be fired simultaneously at the same temperature (900-950°C), thereby eliminating the need for sequential firing operations and reducing total process time while maintaining manufacturing precision
Solution Approach 2:
The patent modifies the chemical composition and sintering characteristics of the cathode material to match the electrolyte's firing temperature range. By adjusting the cathode slurry formulation and sintering parameters, the materials are engineered to achieve optimal densification and adhesion at a unified temperature, enabling process simplification without sacrificing quality
2Manufacturing precision
If a two-step firing process is used to manufacture solid oxide fuel cells, then the manufacturing precision of each layer is improved, but the device complexity increases due to multiple process steps
Solution Approach 1:
The patent merges multiple discrete manufacturing steps (electrolyte firing, cathode application, cathode firing) into an integrated co-sintering process. The laminated structure is prepared with both layers in place, and a single firing operation completes the densification and bonding of all components, significantly reducing process complexity while maintaining layer quality
Solution Approach 2:
The unified firing process serves multiple functions simultaneously: it densifies the electrolyte layer, bonds the cathode to the electrolyte, develops the cathode's porous structure, and achieves interfacial adhesion. This multi-functional approach eliminates the need for separate specialized firing steps for each layer
3Area of stationary object
If conventional tape casting and lamination methods are used to manufacture large-area thin film solid oxide fuel cells, then the area of the fuel cell is increased, but the manufacturing precision of layer thickness and interfacial adhesion deteriorates
Solution Approach 1:
The patent segments the manufacturing process into controlled stages: first preparing individual green films with precise thickness control through tape casting, then laminating them in a controlled sequence. This segmentation allows each layer to be optimized independently while maintaining overall precision in the final large-area structure
Solution Approach 2:
The patent performs preliminary preparation of green films with precisely controlled thicknesses before final assembly. The tape casting process is optimized to produce uniform thin films, and the lamination is performed on these pre-prepared films, ensuring that thickness precision is established early in the process and maintained through subsequent steps
4Area of stationary object
If conventional tape casting and lamination methods are used to manufacture large-area thin film solid oxide fuel cells, then the area of the fuel cell is increased, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple expensive sequential operations into a single co-sintering step, reducing energy consumption, equipment usage time, and labor costs. By firing all layers simultaneously rather than sequentially, the total manufacturing cost is reduced while maintaining the ability to produce large-area cells
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 enables the production of large-area thin film solid oxide fuel cells with a dense microstructure, favorable interfacial adhesion, structural uniformity, and low gas permeability, maximizing electrochemical performance and long-term stability while reducing manufacturing costs.
Implementation Method 1
preparing an anode support green film, an anode functional layer green film, an electrolyte green film, and a buffer layer green film by tape casting the slurries onto carrier films
Implementation Method 2
staking the green films, followed by hot press and warm iso-static press (WIP), to prepare a laminated body
Implementation Method 3
staking the green films, followed by hot press and warm iso-static press (WIP), to prepare a laminated body
Implementation Method 4
co-sintering the laminated body
Data Source
AI summary
Disclosed is a method for manufacturing a large-area thin-film solid oxide fuel cell, the method including: preparing an anode support slurry, an anode functional layer slurry, an electrolyte slurry, and a buffer layer slurry for tape casting; preparing an anode support green film, an anode functional layer green film, an electrolyte green film, and a buffer layer green film by tape casting the slurries onto carrier films; staking the green films, followed by hot press and warm iso-static press (WIP), to prepare a laminated body; and co-sintering the laminated body.