Polymer Electrolyte Membrane Ion Cluster Diameter Control
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Solution Overview
Problem
Conventional polymer electrolyte membranes have high electric resistance and low mechanical strength, which limits their performance in applications such as fuel cells and redox flow batteries, as reducing equivalent weight to lower resistance compromises durability and increasing ion cluster diameter leads to swelling and mechanical weakness.
Innovation Solution
A polymer electrolyte membrane with an ion cluster diameter of 2.96 to 4.00 nm and a converted puncture strength of 300 gf/50 μm or more, composed of a mixture of fluorine-based electrolyte polymers with different monomer structures, and produced through a process involving mixing, casting, and heat treatment at temperatures above 210°C, achieving a balance of low resistance and high mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the equivalent weight is reduced to lower electric resistance, then the ion conductivity is improved, but the mechanical strength decreases
Solution Approach 1:
The patent changes the parameter of ion cluster diameter from conventional sizes to a specific range of 2.96 to 4.00 nm. This parameter change allows the membrane to achieve low electric resistance (high ion conductivity) while maintaining mechanical strength, as the optimized cluster size provides sufficient ion conduction pathways without excessive swelling that would compromise structural integrity.
Solution Approach 2:
The patent uses a composite structure consisting of fluorine-based electrolyte polymers with different monomer structures mixed together. This composite approach creates a synergistic effect where the different polymer components work together to form ion clusters of the desired size range, achieving both high ion conductivity and mechanical strength that cannot be obtained with single polymer systems.
2Reliability
If the ion cluster diameter is increased to improve ion conduction, then the electric resistance is reduced, but the membrane becomes liable to swell and mechanical strength decreases
Solution Approach 1:
The patent precisely controls the ion cluster diameter parameter within the range of 2.96 to 4.00 nm. This optimized parameter range is large enough to provide effective ion conduction pathways (reducing electric resistance) but small enough to prevent excessive swelling that would compromise mechanical strength. The specific lower limit of 2.96 nm ensures sufficient ion conduction while the upper limit of 4.00 nm prevents excessive swelling.
3Reliability
If the membrane thickness is reduced to lower electric resistance, then the ion conductivity is improved, but the mechanical strength and durability decrease
Solution Approach 1:
The patent changes the parameter of ion cluster diameter to 2.96 to 4.00 nm, which creates highly efficient ion conduction pathways within the membrane structure. This allows the membrane to achieve low electric resistance without requiring reduced thickness, thereby maintaining sufficient mechanical strength and durability for long-term operation while still providing excellent ion conductivity.
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 membrane exhibits low electric resistance and high mechanical strength, enhancing performance and durability in fuel cells, redox flow batteries, and water electrolysis applications by forming large ion channels and maintaining structural integrity.
Implementation Method 1
a step of subjecting the cast polymer electrolyte membrane to a heat treatment at a temperature of more than 210° C.
Data Source
AI summary
A polymer electrolyte membrane according to the present invention has a cluster diameter of 2.96 to 4.00 nm and a converted puncture strength of 300 gf/50 μm or more. The polymer electrolyte membrane according to the present invention has a low electric resistance and an excellent mechanical strength.