Polymeric Ionic Liquid Membrane for Stable Lithium Battery Electrolytes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional polymeric ionic liquids used in lithium batteries face challenges in stability and ionic conductivity, limiting their performance and lifespan.
Innovation Solution
A novel polymeric ionic liquid with specific chemical formulations and production processes is developed, including a phenolic epoxy resin subjected to ring-opening reactions and anion replacement, to create a polymer membrane that acts as both an ionic conductor and separator in lithium batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymeric ionic liquids are used in lithium batteries, then the battery can operate with basic ionic conductivity, but the stability and ionic conductivity are insufficient, limiting performance and lifespan
Solution Approach 1:
The patent employs composite materials by combining polymeric ionic liquids with specific polymer matrices (such as polyacrylonitrile, polyvinylidene fluoride, or carboxymethyl cellulose) to create polymer electrolyte membranes. This composite approach allows the system to achieve both high stability from the polymer matrix and high ionic conductivity from the ionic liquid components, resolving the contradiction between stability and ionic conductivity.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying the molecular weight, composition ratio, and chemical structure of the polymeric ionic liquids and polymer matrices. By optimizing these parameters, the invention achieves enhanced stability while maintaining or improving ionic conductivity, thereby resolving the trade-off between these two critical properties.
2Duration of action of moving object
If conventional polymeric ionic liquids are used, then the battery structure is simple, but the electrochemical stability is insufficient for long-term operation
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing polymeric ionic liquids with optimized molecular structures and pre-assembling the polymer electrolyte membrane with specific configurations before battery operation. This preliminary optimization of the electrolyte structure ensures enhanced electrochemical stability and extended cycle life without requiring complex operational procedures or additional components during battery operation.
3Manufacturing precision
If standard polymeric ionic liquids are used, then the manufacturing process is straightforward, but the ionic conductivity and stability are limited
Solution Approach 1:
The patent employs parameter changes by systematically optimizing the molecular weight, composition ratios, and chemical structures of the polymeric ionic liquids and polymer matrices during manufacturing. This approach enables precise control over ionic conductivity and stability while maintaining a relatively straightforward production process, resolving the contradiction between manufacturing precision and ease of manufacture.
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 the stability and ionic conductivity of the polymer electrolyte, improving the performance and cycle life of lithium-ion batteries by maintaining high electrochemical stability and ionic conductivity across a wide temperature range.
Implementation Method 1
subjecting the phenolic epoxy resin to a ring opening reaction using a first compound which is selected from the group consisting of hydrogen halide, substituted or non-substituted pyridine, substituted or non-substituted imidazole, substituted or non-substituted piperidine, substituted or non-substituted pyrrolidine, tertiary amine, tertiary phosphine, and combinations thereof
Implementation Method 2
The gel polymer electrolyte can be used in a lithium battery to act as an ionic conductor as well as a separator that separates an anode and a cathode of the lithium battery
Implementation Method 3
a separator that separates an anode and a cathode of the lithium battery
Implementation Method 4
a process for preparing a gel polymer electrolyte includes a step of soaking the polymer membrane with a lithium-ion containing electrolyte
Data Source
AI summary
A polymeric ionic liquid has a formula (I),where A1, A2, B, k, Q, and Z are as defined in the specification. An intermediate polymer for making the polymeric ionic liquid, a process for producing the polymeric ionic liquid, a process for producing a polymer membrane including the polymeric ionic liquid, a process for preparing a gel polymer electrolyte including the polymer membrane, and a binder including the polymeric ionic liquid are also disclosed.