Polymer Electrolyte for Lithium Air Battery Safety
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Solution Overview
Problem
Conventional lithium batteries face safety issues due to leakage risks from carbonate organic electrolytes and stability problems with polyethylene oxide at high voltages in lithium air batteries, leading to reduced lifespan and impracticality.
Innovation Solution
A polymer electrolyte with a specific compound structure, represented by Formula 1, providing high thermal stability and mechanical properties, and including a lithium ion conductive group, which prevents decomposition and enhances ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyethylene oxide (PEO) is used as a solid electrolyte to eliminate leakage risks, then safety is improved, but the electrolyte decomposes at high voltage leading to reduced battery lifespan
Solution Approach 1:
The patent modifies the chemical structure of PEO by introducing aromatic rings (Ar1 and Ar2), sulfur dioxide groups (—SO2—), and lithium ion conductive groups (R1 and R2) to create a new polymer electrolyte composition that maintains the safety benefits of solid electrolytes while achieving stability at high voltages required for lithium air battery operation
Solution Approach 2:
The patent creates a composite polymer electrolyte system combining PEO with aromatic compounds containing sulfone groups and lithium ion conductive moieties, forming a multi-component material that synergistically provides both safety (solid electrolyte properties) and high-voltage stability (aromatic structure resistance to oxidation)
2Reliability
If conventional carbonate organic electrolyte is used, then ion conductivity is maintained, but leakage risk increases presenting safety issues
Solution Approach 1:
The patent transitions from conventional carbonate organic electrolytes to a solid polymer electrolyte with modified chemical parameters, specifically incorporating aromatic rings and sulfone groups that provide structural integrity to prevent leakage while maintaining ion conductivity through lithium ion conductive groups and optimized molecular weight (500-1,000,000 g/mol)
3Reliability
If PEO is used to provide solid electrolyte properties, then leakage is prevented, but mechanical properties deteriorate due to decomposition at high voltage
Solution Approach 1:
The patent modifies the molecular structure of PEO by incorporating aromatic rings (Ar1 and Ar2) and sulfone groups (—SO2—) that enhance mechanical strength and thermal stability, while the lithium ion conductive groups (R1 and R2) ensure maintained ion conductivity, creating a balanced electrolyte with both solid properties and structural integrity
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 achieves improved thermal stability, mechanical properties, and ion conductivity, effectively suppressing carbon and ionic liquid decomposition, thereby enhancing the lifespan and practicality of lithium air batteries.
Implementation Method 1
a compound represented by Formula 1... at least one selected from R1 and R2 is a lithium ion conductive group
Data Source
AI summary
A polymer electrolyte for a lithium battery, the polymer electrolyte comprising a compound represented by Formula 1:wherein, in Formula 1, X1 to X6, Ar1, Ar2, R1, R2, m, and n are the same as defined in the detailed description of the present specification.