Core-Shell Battery Binder for Separator-Electrode Adhesion
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Solution Overview
Problem
Battery cells experience deteriorated cycling performance due to gaps formed between electrode plates and the separator, leading to poor adhesion and increased risk of battery degradation.
Innovation Solution
A binder is developed comprising a capsule with an organic polymer and a core material, where the plasticizer is encapsulated to enhance adhesion performance, specifically designed to improve the adhesion force between the separator and electrode plates, using a mass ratio of core material to capsule within 1:(10-100) and a median particle size of 0.5 μm-100 μm to ensure stability and effective penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a binder is used to increase adhesion force between separator and electrode plate, then adhesion performance is improved, but the capsule structure may rupture due to insufficient structural stability
Solution Approach 1:
The plasticizer core material is nested inside the polymer capsule shell, creating a core-shell structure where the inner core provides adhesion functionality while the outer shell provides structural protection and stability
Solution Approach 2:
The binder is formed as a composite material combining polymer capsule structures with plasticizer core material, where each component contributes different properties: the polymer provides structural integrity while the plasticizer enhances adhesion performance
2Strength
If the median particle size of binder is reduced to improve penetration, then adhesion performance is enhanced, but separator pores may be blocked reducing lithium ion passage
Solution Approach 1:
The particle size parameter is optimized to a specific range (0.5-100 μm) that balances two competing requirements: small enough to provide good adhesion performance but large enough to avoid blocking separator pores and maintain lithium ion conductivity
3Strength
If mass ratio of core material to capsule is increased to improve adhesion, then adhesion force is enhanced, but capsule structure stability is compromised
Solution Approach 1:
The mass ratio parameter of core material to capsule is optimized to 1:(10-100) to achieve the optimal balance between adhesion performance and structural stability, ensuring sufficient polymer shell material to protect the core while providing adequate adhesion functionality
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 effectively increases the adhesion force between the separator and electrode plates, improving the cycling performance and kinetic performance of battery cells by maintaining battery hardness and preventing electrode plate separation during swelling.
Implementation Method 1
the core material includes a plasticizer. The plasticizer is encapsulated as the core material inside the capsule of the organic polymer to improve adhesion performance of the organic polymer
Data Source
AI summary
This application relates to the field of battery technologies, and in particular, to a binder and a preparation method thereof, and a separator, electrode assembly, battery cell, battery, and electric apparatus containing such binder. The binder includes a capsule and a core material provided in the capsule, where the capsule includes an organic polymer, and the core material includes a plasticizer. The plasticizer is encapsulated as the core material inside the capsule of the organic polymer to improve adhesion performance of the organic polymer, so as to increase adhesion force between a separator and an electrode plate by the binder.