Catalyst Ink Slurry Preparation Using Supercritical CO2 Dispersion
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Solution Overview
Problem
Existing methods for preparing electrodes, such as fuel cells, secondary batteries, and solar cells, face challenges in achieving high-quality dispersibility of ink slurries due to low dispersibility, which adversely affects electrode performance and durability, and the use of additives often deteriorates the quality.
Innovation Solution
A method involving the use of supercritical carbon dioxide to treat a mixture of catalyst and binder in a solvent to create a supercritical state, improving dispersibility without additives, followed by a controlled recovery process to prepare a catalyst slurry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If physical methods such as bath sonication, probe sonication, ball mills, or magnetic stirrers are used to improve dispersibility, then dispersibility is improved to some extent, but the process complexity and energy consumption increase significantly
Solution Approach 1:
The patent changes the physical state parameters of carbon dioxide from gaseous to supercritical state by adjusting temperature and pressure parameters. This parameter change enables carbon dioxide to achieve superior dispersibility in the ink slurry without requiring complex mechanical dispersing equipment or processes, thus resolving the contradiction between manufacturing precision and device complexity
Solution Approach 2:
The patent utilizes the phase transition of carbon dioxide from gas to supercritical fluid state, and then back to gas state after treatment. This phase transition mechanism allows carbon dioxide to effectively penetrate and disperse catalyst particles throughout the ink slurry, achieving high dispersibility without complex mechanical processes
2Manufacturing precision
If additives are added to improve the dispersibility of ink slurry, then dispersibility is improved, but the electrode quality deteriorates due to the additives
Solution Approach 1:
The patent uses supercritical carbon dioxide as an intermediary substance to improve dispersibility. The supercritical CO2 acts as a mediator that enhances catalyst dispersion without remaining in the final product, thus avoiding the quality deterioration caused by traditional additives while maintaining high dispersibility
Solution Approach 2:
The patent employs carbon dioxide that can be easily removed after the dispersing process. The supercritical CO2 performs its dispersing function and then is discarded or recovered by simply reducing pressure and temperature, leaving no harmful residues in the electrode, thus maintaining electrode quality while achieving improved dispersibility
3Ease of manufacture
If conventional mixing methods are used to prepare ink slurry, then the process is simple, but the dispersibility and electrode performance are insufficient
Solution Approach 1:
The patent replaces mechanical mixing systems (sonicators, ball mills, magnetic stirrers) with a supercritical fluid treatment system. This substitution maintains operational simplicity while dramatically improving dispersibility, as the supercritical CO2 penetrates and distributes catalyst particles uniformly throughout the ink slurry without requiring complex mechanical forces
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 method enhances dispersibility, leading to improved electrode quality and durability, with reduced particle aggregation and increased electrochemical performance.
Implementation Method 1
a supercritical state creation step of increasing the pressure and temperature of the chamber to create a supercritical state; and a supercritical treatment step of supercritically treating the mixture under the supercritical state
Data Source
AI summary
The present disclosure relates to a method for preparing a catalyst and an electrode using a supercritical fluid. A method for preparing an ink slurry according to the present disclosure allows the preparation of an ink slurry with improved dispersibility in large quantities in a simple and environmentally friendly manner.