Gel Polymer Electrolyte Composition for High-Temperature Battery Stability
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Solution Overview
Problem
Existing lithium secondary batteries using gel polymer electrolytes face challenges in high-temperature storage stability and oxidation stability, leading to potential side reactions and reduced performance.
Innovation Solution
A composition for a gel polymer electrolyte is developed, incorporating a lithium salt, a non-aqueous organic solvent, a polymerization initiator, and an oligomer with a polycarbonate group, acrylate group, and urethane group, which improves wetting and forms a stable film on the electrode surface at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gel polymer electrolyte is used to improve stability and flexibility, then the risk of leakage and explosion is reduced, but side reactions between the electrolyte and electrode surface occur more frequently at high temperatures
Solution Approach 1:
The patent introduces a fluorinated oligomer with specific molecular weight (1,000-100,000) and fluorine content (1-50 wt%) to modify the electrolyte composition. This parameter change in the oligomer structure creates a protective interface layer that reduces side reactions between the gel polymer electrolyte and electrode surface, particularly at high temperatures, while maintaining the stability benefits of the gel polymer electrolyte.
Solution Approach 2:
The patent creates a composite electrolyte system by combining gel polymer electrolyte with fluorinated oligomer. This composite approach integrates the stability and flexibility advantages of gel polymer electrolyte with the protective interface-forming capabilities of fluorinated compounds, thereby reducing side reactions without sacrificing the inherent stability benefits.
2Reliability
If conventional gel polymer electrolyte composition is used, then basic battery function is achieved, but oxidation stability is insufficient leading to reduced high-temperature storage stability
Solution Approach 1:
The patent modifies the electrolyte composition by incorporating fluorinated oligomer with specific parameters: molecular weight of 1,000-100,000 and fluorine content of 1-50 wt%. These parameter changes enhance the oxidation stability of the electrolyte system, preventing degradation at high temperatures and improving overall high-temperature storage stability of the battery.
Solution Approach 2:
The fluorinated oligomer concentrates its protective effect at the electrode-electrolyte interface, creating a localized region with enhanced oxidation resistance. This local quality improvement at the critical interface region prevents oxidation-related degradation while maintaining the bulk electrolyte properties necessary for basic battery function.
3Ease of manufacture
If polymerization is performed at elevated temperature to achieve gelation, then gel polymer electrolyte is formed, but economic and time losses occur due to temperature maintenance requirements
Solution Approach 1:
The fluorinated oligomer acts as a self-assembling component that spontaneously forms the protective interface layer during battery assembly without requiring external energy input or additional processing steps. This self-service mechanism eliminates the need for separate temperature maintenance steps, reducing both time loss and manufacturing complexity.
4Ease of operation
If pre-gelation occurs at room temperature before injection, then injection process becomes difficult, but overall battery performance degrades due to decreased wetting
Solution Approach 1:
The fluorinated oligomer modifies the surface energy and wettability parameters of the electrolyte composition, enabling it to maintain good wetting characteristics even when partial gelation occurs before injection. This parameter modification ensures that the electrolyte can properly wet the electrode surfaces regardless of the injection timing, preventing performance degradation.
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 improved gel polymer electrolyte enhances oxidation stability by suppressing side reactions and improves high-temperature storage stability of lithium secondary batteries, leading to better overall performance and durability.
Implementation Method 1
a composition for a gel polymer electrolyte which includes a lithium salt, a non-aqueous organic solvent, a polymerization initiator, and an oligomer
Implementation Method 2
the oligomer...forms a stable film on the electrode surface at high temperatures
Data Source
AI summary
The present invention relates to a composition for a gel polymer electrolyte, which includes a lithium salt, a non-aqueous organic solvent, a polymerization initiator, and an oligomer containing a polycarbonate-based repeating unit, a gel polymer electrolyte in which mechanical strength and ion transfer capability are improved by polymerization of the composition for a gel polymer electrolyte, and a lithium secondary battery in which external impact and stability during high-temperature storage are improved by including the gel polymer electrolyte.