Heterocyclic Diazole Ionic Liquid Polymer Electrolyte Membrane
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Solution Overview
Problem
Polymer electrolyte membranes impregnated with alkylimidazole-based ionic liquids have insufficient protic sites for efficient proton transport, limiting their performance in applications such as electroactive polymer actuators, lithium batteries, and high-temperature fuel cells.
Innovation Solution
A highly conductive polymer electrolyte membrane is developed using a heterocyclic diazole-based ionic liquid with two protic sites, specifically 2-alkylimidazole, which decreases the glass transition temperature and enhances ion transport, incorporated into a self-assembled block copolymer like poly(styrenesulfonate-b-methylbutylene) to form ordered nanostructures for improved conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alkylimidazole-based ionic liquids are used in polymer electrolyte membranes, then the membranes can be manufactured with existing methods, but the protic sites are insufficient for efficient proton transport
Solution Approach 1:
The patent changes the chemical structure parameter of the ionic liquid from alkylimidazole to heterocyclic diazole (specifically 2-alkylimidazole with two protic sites), which fundamentally alters the protic site availability and enables efficient proton transport while maintaining manufacturing compatibility
Solution Approach 2:
The patent creates a composite system by incorporating heterocyclic diazole-based ionic liquids into block copolymer matrices (such as poly(styrenesulfonate-b-methylbutylene)), forming a composite material that combines the advantages of both components to achieve high conductivity and ordered nanostructures
2Reliability
If the glass transition temperature is decreased to enhance ion transport, then ionic conductivity improves, but the structural stability of the membrane may be compromised
Solution Approach 1:
The patent deliberately changes the glass transition temperature parameter by selecting specific heterocyclic diazole ionic liquids with appropriate molecular structures, achieving an optimal balance between low enough Tg for ion transport and high enough structural stability for membrane integrity
Solution Approach 2:
The patent creates local ordered nanostructures within the membrane where heterocyclic diazole ionic liquids cluster to form conductive pathways, allowing different regions to have different functions: some regions provide structural stability while others provide high ionic 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 high ionic conductivity and various ordered nanostructures depending on the ionic liquid, leading to enhanced performance in electroactive polymer actuators, lithium batteries, and high-temperature fuel cells, with the 2-methylimidazole-based membrane showing favorable ion transport characteristics.
Implementation Method 1
2-alkylimidazole having two protic sites and able to decrease the glass transition temperature of a polymer membrane
Implementation Method 2
insufficient protic sites where protons may be efficiently transported while being donated to or received from the [CnIm]-based ionic liquids
Implementation Method 3
incorporated into a self-assembled block copolymer like poly(styrenesulfonate-b-methylbutylene) to form ordered nanostructures for improved conductivity
Data Source
AI summary
The present invention relates to a highly conductive electrolyte comprising an ionic liquid and to a polymer electrolyte membrane using same, and more particularly, to a highly conductive polymer electrolyte membrane impregnated with a heterocyclic diazole-based ionic liquid and to a method for manufacturing same. The present invention relates to a polymer electrolyte thin film comprising an ionic liquid based on an imidazole compound represented by chemical formula (1), wherein R1 is an alkyl having a carbon number of 1 to 8 and R2 is hydrogen or an alkyl having a carbon number of 1 to 8: