Reinforced Composite Membrane Coating for Sub-50 μm Fuel Cell Films
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Solution Overview
Problem
Existing manufacturing processes struggle to produce reinforced composite membranes with a thickness of less than 50 μm, which is necessary for enhanced ionic conductivity and reduced resistance in fuel cells.
Innovation Solution
A method using a gantry slot die coater to apply an ionomer solution onto both surfaces of a porous support, followed by drying, to achieve a thin reinforced composite membrane. The process involves precise control of the gantry slot die coater's nozzle moving speed, discharge height, and discharge flow rate, along with a drying temperature of 130 to 150° C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If typical manufacturing processes are used, then manufacturing simplicity is maintained, but membrane thickness cannot be reduced below 50 μm
Solution Approach 1:
The patent changes the key parameter of membrane thickness to 50 μm or less, which requires modifying the manufacturing process parameters including using a slot die coater with controlled discharge height of 50-75 μm, discharge flow rate of 0.5-2.5 mL/min, and nozzle moving speed of 3-7 mm/s to achieve the target thickness
Solution Approach 2:
The patent replaces typical mechanical manufacturing methods with a slot die coater system that uses controlled material discharge and drying processes. The slot die coater mechanism with its specific nozzle design and controlled movement system enables precise thickness control that cannot be achieved through conventional mechanical means
2Reliability
If membrane thickness is reduced to enhance ionic conductivity, then ionic conductivity and electrical performance are improved, but manufacturing difficulty increases
Solution Approach 1:
The patent systematically changes multiple parameters including membrane thickness (to 10-25 μm), discharge height (50-75 μm), discharge flow rate (0.5-2.5 mL/min), and nozzle moving speed (3-7 mm/s) to achieve both thin membrane formation and manufacturing feasibility
Solution Approach 2:
The patent implements feedback control through precise monitoring and adjustment of process parameters during manufacturing. The controlled discharge flow rate and nozzle moving speed are regulated to maintain consistent coating thickness, ensuring both ionic conductivity requirements and manufacturing repeatability are met
3Productivity
If conventional manufacturing methods are used, then process simplicity is maintained, but manufacturing time and costs are high
Solution Approach 1:
The patent implements a continuous manufacturing process using the slot die coater that can continuously coat membranes without interruption. The gantry system moves the nozzle continuously at controlled speeds (3-7 mm/s) while material is discharged and dried in sequence, eliminating batch processing steps and significantly improving manufacturing efficiency
Solution Approach 2:
The patent performs preliminary preparation of the ionomer solution with controlled viscosity and composition before the coating process. The solution is pre-mixed and degassed to ensure uniform coating, and the slot die coater is pre-positioned with optimized discharge height (50-75 μm) and flow rate settings before production begins, reducing setup time and enabling immediate continuous operation
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 successfully produces reinforced composite membranes with a thickness of 10 to 25 μm, enhancing ionic conductivity and reducing resistance, while also reducing manufacturing time and costs through a continuous process.
Implementation Method 1
applying the ionomer solution onto one surface of the porous support using a gantry slot die coater, and applying the ionomer solution onto the other surface of the porous support using a gantry slot die coater
Implementation Method 2
drying the ionomer solution applied onto one surface of the porous support after the applying of the ionomer solution onto one surface of the porous support
Data Source
AI summary
The present invention relates to a method for manufacturing a reinforced composite membrane using a gantry slot die coater, and to a reinforced composite membrane manufactured using the same and a fuel cell including the same, wherein the method for manufacturing a reinforced composite membrane includes preparing an ionomer solution, preparing a porous support, applying the ionomer solution onto one surface of the porous support using a gantry slot die coater, and applying the ionomer solution onto the other surface of the porous support using a gantry slot die coater.