Block Polymer Electrolyte Membrane for Cation Conductivity
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Solution Overview
Problem
Partial fluorine-based polymer electrolyte membranes exhibit low cation conductivity due to ineffective control of micro-phase separation and aggregation of cation transfer functional groups.
Innovation Solution
A block polymer with a hydrophobic block and a hydrophilic block, where the hydrophilic block includes a unit derived from a specific compound with a cationic group and a halogen group, facilitating controlled phase separation and enhancing cation conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a partial fluorine-based polymer electrolyte membrane is used to achieve physical and chemical stability, then thermal stability and chemical resistance are improved, but cation conductivity deteriorates due to ineffective micro-phase separation control
Solution Approach 1:
The polymer is segmented into distinct hydrophobic blocks (providing chemical stability) and hydrophilic blocks (providing cation conductivity). This block copolymer structure creates micro-phase separated domains where each block performs its specific function, resolving the contradiction between chemical stability and cation conductivity
Solution Approach 2:
The invention uses a composite block polymer structure combining fluorinated hydrophobic segments with non-fluorinated hydrophilic segments containing cation transfer groups. This composite approach allows simultaneous achievement of fluorine-based chemical stability and effective cation transport through the hydrophilic domains
2Strength
If a partial fluorine-based polymer electrolyte membrane is used to achieve physical stability, then mechanical strength is improved, but cation conductivity deteriorates due to aggregation of cation transfer functional groups
Solution Approach 1:
The block copolymer structure segments the polymer into mechanically strong hydrophobic blocks and ion-conductive hydrophilic blocks. The micro-phase separation creates distinct domains that maintain mechanical integrity while enabling cation transport, preventing aggregation of cation transfer groups
Solution Approach 2:
Different regions of the polymer have different local properties: hydrophobic blocks provide mechanical strength and chemical stability, while hydrophilic blocks provide cation conductivity. This local differentiation allows each region to optimize its function without compromising the other
3Stability of the object's composition
If micro-phase separation is not effectively controlled, then polymer stability is maintained, but cation conductivity deteriorates due to aggregation of cation transfer functional groups
Solution Approach 1:
The block copolymer architecture inherently provides controlled micro-phase separation through the segregation of hydrophobic and hydrophilic blocks. This segmentation maintains polymer stability while preventing aggregation of cation transfer groups in the hydrophilic domains, enabling effective cation 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 polymer electrolyte membrane achieves improved cation conductivity, reduced vanadium ion crossover, and enhanced durability, effectively functioning as both a cation and anion separator, thereby improving battery performance.
Implementation Method 1
a block polymer including a hydrophobic block; and a hydrophilic block, wherein the hydrophilic block includes a unit derived from a compound represented by the following Chemical Formula 1, and the hydrophobic block includes a cationic group and a halogen group
Implementation Method 2
researches have been progressed in the direction of securing high cation conductivity through controlling distribution and micro-phase separation of a sulfonic acid group
Data Source
AI summary
The present specification relates to a block polymer and a polymer electrolyte membrane including the same, a membrane-electrode assembly including the polymer electrolyte membrane, a fuel cell including the membrane-electrode assembly and a redox flow battery including the polymer electrolyte membrane.