Polymer Electrolyte with Ionic Liquid for Safe High-Conductivity Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lithium-ion batteries face issues with liquid electrolytes due to leakage, flammability, and high vapor pressure at high temperatures, while solid electrolytes have low ionic conductivity, necessitating a polymer electrolyte that maintains a solid phase with high ionic conductivity and stability.
Innovation Solution
A polymer electrolyte comprising a polymer matrix with an ammonium-based repeating unit and an ionic liquid, optionally including a metal salt, is developed, with specific formulations and preparation methods to achieve high ionic conductivity and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolyte is used, then ionic conductivity is improved, but safety deteriorates due to leakage, flammability, and high vapor pressure
Solution Approach 1:
The patent uses a composite structure combining polymer matrix (providing mechanical stability and safety) with ionic liquid (providing high ionic conductivity). This composite approach allows the electrolyte to simultaneously achieve the benefits of both liquid and solid electrolytes while avoiding their respective drawbacks.
Solution Approach 2:
The patent changes the physical state parameter of the electrolyte by using ionic liquid instead of conventional liquid, and combines it with polymer matrix to create a gel-like structure that maintains solid-phase safety while preserving liquid-like ionic conductivity.
2Object-affected harmful factors
If solid electrolyte is used, then safety is improved, but ionic conductivity deteriorates
Solution Approach 1:
The patent creates a composite electrolyte system where the polymer matrix provides the solid-phase safety and structural integrity, while the incorporated ionic liquid provides the high ionic conductivity typically associated with liquid electrolytes.
Solution Approach 2:
The ionic liquid acts as an intermediary substance that bridges the gap between solid polymer matrix and liquid electrolyte, transferring the high ionic conductivity property to the solid-phase structure without compromising safety.
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 exhibits superior ionic conductivity and stability, maintaining mechanical properties with an electrochemical window of 4.88 V, enhancing battery performance and stability compared to existing technologies.
Implementation Method 1
the polymer electrolyte exhibits superior ionic conductivity and stability
Data Source
AI summary
A polymer electrolyte includes a polymer matrix including a polymer having a repeating unit represented by the formulaand an ionic liquid. R1 to R3 are each one of a substituted or unsubstituted C1-C12 alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, or combinations thereof. Each R4 is one of hydrogen, a halogen group, a nitrile group, a nitro group, an amine group, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C1-C10 alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted C5-C14 heteroaryl group, or combinations thereof. Substituents of R1 to R4 are each one of a halogen group, a cyano group, a nitro group, a C1-C8 alkyl group, or combinations thereof, x is an integer of 1 to 8, and n is an integer of 60 to 3200.