Core-Shell Battery Binder for Adhesion and Low Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing binders for rechargeable lithium batteries face a trade-off between adhesive strength and electrical resistance, with high adhesive strength often leading to high resistance, which affects battery performance.
Innovation Solution
A binder with a core-shell structure, comprising a (meth)acrylic acid-based monomer, a (C1-C10) alkylene glycol-based monomer, and a zwitterionic vinyl- or (meth)acryl-based monomer, which enhances adhesive strength while reducing electrical resistance by improving lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If binders with high adhesive strength are used, then adhesive strength is improved, but electrical resistance increases
Solution Approach 1:
The binder is designed as a composite material comprising three distinct structural units: (meth)acrylic acid-based units for adhesion, alkylene glycol-based units for flexibility and ion transport, and zwitterionic vinyl/methacryl-based units for enhanced ionic conductivity. This composite structure allows simultaneous achievement of high adhesive strength and low electrical resistance by combining materials with complementary properties.
Solution Approach 2:
Different regions of the binder molecule are assigned specific functions: the (meth)acrylic acid-based structural units provide localized adhesive properties for bonding electrode materials, while the zwitterionic vinyl/methacryl-based units create localized high-ion-conductivity pathways. This spatial differentiation of functional properties within the binder structure enables optimization of both adhesion and electrical resistance independently.
2Strength
If high adhesive strength binders are used, then bonding performance is improved, but battery performance deteriorates due to high resistance
Solution Approach 1:
The binder combines three types of structural units in specific proportions to achieve both strong bonding and high productivity. The alkylene glycol-based units with flexible chains facilitate rapid lithium ion diffusion, directly improving charging/discharging rates and overall battery productivity, while maintaining strong adhesion through the acrylic acid units.
Solution Approach 2:
The introduction of zwitterionic vinyl/methacryl-based structural units fundamentally changes the ionic conductivity parameter of the binder. These units create highly conductive pathways for lithium ions, reducing resistance and enabling faster ion transport, which directly enhances battery productivity during rapid charging and discharging operations.
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 binder improves the performance of rechargeable lithium batteries by balancing adhesive strength and resistance, facilitating better manufacturing and reducing side effects during rapid charging.
Implementation Method 1
a third structural unit derived from a zwitterionic vinyl-based monomer or a zwitterionic (meth)acryl-based monomer
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a binder for a rechargeable lithium battery having a core-shell structure. The shell includes a first structural unit derived from a (meth)acrylic acid-based monomer; a second structural unit derived from a (C1-C10) alkylene glycol-based monomer; and a third structural unit derived from a zwitterionic vinyl-based monomer or a zwitterionic (meth)acryl-based monomer. The binder for a rechargeable lithium battery has high adhesive strength and low resistance, and thus can contribute to improving the performance of a rechargeable lithium battery.