Gel Polymer Electrolyte Crosslinking for Battery Safety and Strength
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Solution Overview
Problem
Current gel polymer electrolytes used in batteries suffer from poor mechanical strength and ion conductivity, making them unsuitable for mass production and leading to degradation in battery quality and safety issues.
Innovation Solution
A composition for a gel polymer electrolyte is developed, comprising a cyclic compound as a first crosslinking agent for enhancing mechanical strength and a linear or branched compound with oxyalkylene groups as a second crosslinking agent for improving ion conductivity, along with an electrolyte solvent, electrolyte salt, and polymerization initiator, which are polymerized to form a gel polymer electrolyte with excellent mechanical strength and ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gel polymer electrolytes are used to improve battery safety compared to liquid electrolytes, then safety is improved, but mechanical strength and ion conductivity are insufficient
Solution Approach 1:
The patent uses a composite gel polymer electrolyte system combining PVdF-HFP polymer matrix with multiple crosslinking agents (containing acryl groups and oxyalkylene groups) to create a multi-component composite material that simultaneously achieves improved mechanical strength, ion conductivity, and safety - resolving the contradiction between safety improvement and mechanical property maintenance
2Reliability
If gel polymer electrolytes are used to improve battery safety compared to liquid electrolytes, then safety is improved, but ion conductivity is insufficient
Solution Approach 1:
The patent modifies the chemical structure and composition parameters of the gel polymer electrolyte by introducing crosslinking agents with specific functional groups (acryl groups and oxyalkylene groups) that change the polymer network structure to optimize ion transport pathways while maintaining safety benefits, thereby improving ion conductivity without sacrificing safety
3Reliability
If conventional gel polymer electrolytes are used, then battery safety is improved compared to liquid electrolytes, but manufacturing complexity increases due to multiple components
Solution Approach 1:
The patent combines multiple functional components (polymer matrix, crosslinking agents with dual functionality, electrolyte salts, and solvents) into a single integrated gel polymer electrolyte system that can be processed together, reducing manufacturing steps and complexity while maintaining the safety advantages of gel polymer electrolytes
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 resulting gel polymer electrolyte exhibits improved mechanical strength and ion conductivity, leading to enhanced battery quality and safety, with the optimal ratio of crosslinking agents ensuring effective ion transfer and mechanical stability.
Implementation Method 1
a composition for a gel polymer electrolyte, the composition comprising: (i) a cyclic compound as a first crosslinking agent, the cyclic compound containing a cyclic group at the center thereof and having at least three double bonds at the end thereof; (ii) a linear or branched compound as a second crosslinking agent, the linear or branched compound containing an oxyalkylene group at the center thereof and having at least two (meth)acryl groups at the end thereof
Implementation Method 2
a composition for a gel polymer electrolyte, the composition comprising: (i) a cyclic compound as a first crosslinking agent... (ii) a linear or branched compound as a second crosslinking agent... (v) a polymerization initiator
Implementation Method 3
The resulting gel polymer electrolyte exhibits improved mechanical strength and ion conductivity, leading to enhanced battery quality and safety, with the optimal ratio of crosslinking agents ensuring effective ion transfer
Data Source
AI summary
Disclosed is a composition for a gel polymer electrolyte, the composition comprising: (i) a cyclic compound as a first crosslinking agent, the cyclic compound containing a cyclic group at the center thereof and having at least three double bonds at the end thereof; (ii) a linear or branched compound as a second crosslinking agent, the linear or branched compound containing an oxyalkylene group at the center thereof and having at least two (meth)acryl groups at the end thereof; (iii) an electrolyte solvent; (iv) an electrolyte salt; and (v) a polymerization initiator. Also, disclosed are a gel polymer electrolyte formed by polymerizing the composition for a gel polymer electrolyte, and an electrochemical device comprising the gel polymer electrolyte.