Lithium Battery Electrode Binder for Gel Polymer Adhesion
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Solution Overview
Problem
Lithium secondary batteries using liquid electrolytes face safety issues due to degradation and volatility of organic solvents, leading to increased internal resistance and reduced safety, as well as poor adhesion of gel polymer electrolytes to conventional electrodes, which limits their uniform distribution and mobility of lithium ions.
Innovation Solution
An electrode for lithium secondary batteries is developed with an organic binder containing ethylenically unsaturated groups, such as vinyl or acryloxy groups, which undergoes radical polymerization with oligomers in the gel polymer electrolyte, enhancing adhesion and forming a uniform polymer network, thereby improving the interface between the electrode and electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid electrolyte is used, then battery performance is improved, but safety deteriorates due to degradation and volatility of organic solvents
Solution Approach 1:
The patent uses a composite material structure consisting of a gel polymer electrolyte layer combined with a porous polymer coating layer. The gel polymer electrolyte provides good ionic conductivity while the porous polymer coating layer prevents solvent leakage and degradation, creating a composite system that maintains performance while improving safety.
Solution Approach 2:
The patent employs a thin film structure where the gel polymer electrolyte is formed as a flexible layer between electrodes, and a porous polymer coating is applied as a protective thin film on the electrode surface. This thin film approach maintains battery performance while providing safety through physical containment and solvent management.
2Reliability
If gel polymer electrolyte is used, then safety is improved, but adhesion to electrode deteriorates leading to poor uniform distribution
Solution Approach 1:
The patent applies local quality modification by creating a porous polymer coating layer specifically on the electrode surface where contact with the gel polymer electrolyte occurs. This localized treatment enhances adhesion at the critical interface between electrode and electrolyte, ensuring uniform distribution of the gel polymer electrolyte while maintaining the safety benefits of the gel structure throughout the battery.
3Reliability
If conventional electrode is used with gel polymer electrolyte, then safety is improved, but internal resistance increases due to poor adhesion
Solution Approach 1:
The patent creates a composite structure with a porous polymer coating layer on the conventional electrode that is compatible with the gel polymer electrolyte. This composite interface reduces contact resistance and improves ion transport efficiency, thereby reducing internal resistance while maintaining the safety advantages of using gel polymer electrolyte.
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
This solution enhances the adhesion between the electrode and gel polymer electrolyte, reducing internal resistance and improving the safety and performance of lithium secondary batteries by ensuring uniform electrolyte distribution and stability, even under harsh conditions.
Implementation Method 1
an organic binder containing an ethylenically unsaturated group... which undergoes radical polymerization with oligomers in the gel polymer electrolyte
Data Source
AI summary
The present invention relates to an electrode for a lithium secondary battery, which includes an electrode current collector and an electrode active material layer which is formed on one surface of the electrode current collector and includes an electrode active material and an organic binder containing an ethylenically unsaturated group, and a lithium secondary battery including the same.