Asymmetric Nanofiber Electrolyte Membrane for Fuel Cells
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Solution Overview
Problem
Conventional fuel cell electrolyte membranes face challenges in achieving high electric power generation performance and productivity due to complex manufacturing processes and insufficient mechanical and proton conduction properties, particularly with reinforcing materials buried at the center or only on the surface.
Innovation Solution
An electrolyte membrane with a nanofiber unwoven cloth buried in the electrolyte resin, exposed only from the anode electrode face, improves mechanical and proton conduction properties by reducing process steps and enhancing surface area for proton conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stretched porous membrane is disposed at the substantial center of the electrolyte membrane, then the mechanical property is improved, but the productivity deteriorates due to requiring double application and drying processes
Solution Approach 1:
The patent applies asymmetry by positioning the reinforcing body off-center within the electrolyte membrane, specifically closer to the cathode electrode side. This asymmetric placement allows the membrane to be manufactured with a single application and drying process of the electrolyte resin composition, eliminating the need for double-sided processing while maintaining mechanical strength. The reinforcing body is disposed at a position where it provides sufficient support without requiring symmetric bilateral treatment.
Solution Approach 2:
The patent employs preliminary action by pre-positioning the reinforcing body on one side (cathode side) before applying the electrolyte resin composition. This preliminary placement allows the subsequent single coating process to sufficiently cover and bond the reinforcing body, eliminating the need for a second application process that would otherwise be required to achieve uniform coverage from both sides.
2Power
If the electrolyte membrane thickness is reduced to improve power generation performance, then the electric power generation property is improved, but the mechanical property deteriorates
Solution Approach 1:
The patent applies composite materials by combining the electrolyte resin with a reinforcing body (stretched porous membrane or nanofiber unwoven cloth) to create a composite structure. This composite allows the electrolyte membrane to maintain thin thickness for high power generation performance while the embedded reinforcing body provides the necessary mechanical strength and dimensional stability that a thin electrolyte layer alone cannot provide.
Solution Approach 2:
The patent applies local quality by concentrating the mechanical reinforcement function in specific localized regions through the reinforcing body, rather than uniformly thickening the entire membrane. The electrolyte resin maintains its thin, high-performance characteristics in the active ion-conducting regions, while the reinforcing body is strategically positioned to provide mechanical support where needed, particularly near the cathode side.
3Strength
If a reinforcing body is buried in the electrolyte resin, then the mechanical property is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent applies merging by combining the reinforcing body placement and electrolyte resin application into a single integrated manufacturing step. The reinforcing body is positioned on the cathode electrode side, and the electrolyte resin composition is applied in one coating process that simultaneously covers the reinforcing body and forms the complete electrolyte membrane structure, eliminating the need for separate sequential steps.
Solution Approach 2:
The patent employs preliminary action by pre-positioning the reinforcing body on the cathode electrode side before applying the electrolyte resin composition. This preliminary placement, combined with the subsequent single coating process, simplifies the manufacturing process by eliminating the need for multiple application and drying cycles that would be required if the reinforcing body needed to be centered or positioned symmetrically.
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 solution enhances electric power generation performance and productivity by simplifying the manufacturing process, improving mechanical durability, and maintaining proton conduction efficiency.
Implementation Method 1
impregnating the reinforcing body 52 with the electrolyte solution 51a
Implementation Method 2
the electrolyte solution 51a is dried to be the electrolyte resin 51
Implementation Method 3
a perfluorosulphonic acid polymer that is a fluorine-based electrolyte resin (an ion exchanger resin)
Data Source
AI summary
In an electrolyte membrane for a fuel cell, having nanofiber unwoven cloth buried in an electrolyte resin, the nanofiber unwoven cloth is disposed being exposed only from one face of the electrolyte membrane. The fuel cell includes a MEA having an anode electrode disposed on one face of the electrolyte membrane and having a cathode electrode disposed on the other face thereof, and a pair of separators holding the MEA by sandwiching the MEA therebetween. Thereby, the electrolyte membrane for a fuel cell, the manufacturing method of the electrolyte membrane, and the fuel cell are provided with which the electric power generation property and productivity are improved.