Polycarbonate Gel Polymer Electrolyte for Conductive Electrode Adhesion
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Solution Overview
Problem
Current gel polymer electrolytes for lithium secondary batteries suffer from inferior conductivity and adhesion to electrodes, leading to safety and performance issues due to phase differences between the non-aqueous solvent and the polymer network, which affects the uniform distribution of lithium ions and overall battery stability.
Innovation Solution
A composition for a gel polymer electrolyte is developed, incorporating an oligomer with a polycarbonate group that enhances reactivity with the non-aqueous solvent, improving electroconductivity and adhesion to electrodes, comprising a polymerization initiator, non-aqueous solvent, and lithium salt, with specific molecular weight ranges for the oligomer to ensure optimal viscosity and ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gel polymer electrolyte is used to improve safety and prevent battery thickness increase, then safety and structural stability are improved, but conductivity and adhesion to electrodes deteriorate due to phase differences between non-aqueous solvent and polymer network
Solution Approach 1:
The patent changes the chemical composition parameters of the gel polymer electrolyte by incorporating specific additives (cyclic carbonate and chain carbonate in optimized ratios) to modify the polymer network structure and its interaction with lithium ions, thereby improving conductivity while maintaining safety
Solution Approach 2:
The patent creates a composite gel polymer electrolyte system combining multiple components (polymer matrix, non-aqueous solvent, cyclic carbonate additive, and chain carbonate additive) that work synergistically to resolve the contradiction between safety and conductivity through enhanced phase compatibility
2Stability of the object's composition
If a gel polymer electrolyte is used to maintain constant battery thickness, then structural stability is improved, but adhesion to electrodes deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the gel polymer electrolyte by adding specific carbonate components that enhance the electrolyte's ability to wet and adhere to electrode surfaces while maintaining its gel structure and thickness stability
3Manufacturing precision
If non-aqueous organic solvent is added to gel polymer electrolyte to improve ion distribution, then conductivity may improve, but thermal stability and performance deteriorate
Solution Approach 1:
The patent optimizes the ratio and types of carbonate additives (cyclic vs. chain) to achieve uniform lithium ion distribution while maintaining thermal stability by preventing excessive solvent content and ensuring proper polymer-solvent interactions
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 achieves enhanced electroconductivity, cycle performance, and safety by ensuring uniform lithium ion distribution and increased adhesion to electrodes, thereby stabilizing battery performance and safety.
Implementation Method 1
a polymerization initiator; a non-aqueous solvent; a lithium salt; and an oligomer
Implementation Method 2
which has improved conductivity and adhesion to an electrode
Implementation Method 3
adhesion to an electrode and may improve the performance of a battery
Data Source
AI summary
The present invention provides a composition for a gel polymer electrolyte, including an oligomer represented by Formula 1; a polymerization initiator; a non-aqueous solvent; and a lithium salt, and a gel polymer electrolyte and a lithium secondary battery including the same.