Acid Resistant Adhesive Composition for Battery Packaging
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Solution Overview
Problem
Current adhesive compositions for lithium ion battery packaging materials lack sufficient peel strength and are costly to apply, as they require complex surface treatment to bond polymer layers with metal layers, which are prone to corrosion from electrolyte solutions.
Innovation Solution
An acid-resistant adhesive composition comprising polychloroprene rubber, epoxy silane, amino silane, unsaturated silane, and organic solvent, prepared under nitrogen gas protection, which enhances bonding strength and resistance to electrolyte solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chromate conversion treatment or grafting modification is used to improve adhesion between polymer layer and metal layer, then bonding strength is improved, but process complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the complex surface treatment steps (chromate conversion treatment or grafting modification) by using a simple adhesive composition that achieves strong bonding without requiring pre-treatment of the polymer layer surface
Solution Approach 2:
The adhesive composition uses a composite system combining polychloroprene rubber with multiple silane compounds (epoxy silane, amino silane, unsaturated silane) to achieve both strong bonding and acid resistance through synergistic effects of different functional groups
2Reliability
If polymer layer is used to protect metal layer from electrolyte corrosion, then corrosion protection is achieved, but adhesion between polymer and metal is insufficient
Solution Approach 1:
The adhesive composition acts as an intermediary layer between the polymer layer and metal layer, containing silane compounds that can bond to both the polymer surface and metal substrate, while also providing acid resistance to protect the metal from electrolyte corrosion
3Ease of manufacture
If simple adhesive composition is used for bonding polymer and metal layers, then process simplicity is achieved, but peel strength and acid resistance are insufficient
Solution Approach 1:
The adhesive composition uses a composite system combining polychloroprene rubber with multiple silane compounds (epoxy silane, amino silane, unsaturated silane) to achieve both strong bonding and acid resistance through synergistic effects of different functional groups
Solution Approach 2:
The patent modifies the chemical composition parameters of the adhesive by incorporating specific ratios of different silane compounds and polychloroprene rubber, changing the physical and chemical properties to achieve both high peel strength and acid resistance
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 adhesive composition exhibits excellent initial and final peel strength, maintaining a high bonding strength even after exposure to electrolyte solutions, thus providing effective protection against corrosion and simplifying the bonding process.
Implementation Method 1
comprising: (a) at least one polychloroprene rubber; (b) at least one epoxy silane; (c) at least one amino silane; (d) at least one unsaturated silane containing one or more non-aromatic carbon-carbon double bonds
Implementation Method 2
In the presence of water, the lithium salts will be hydrolyzed to form hydrofluoric (HF) acid and cause corrosion to metal surfaces. Therefore, the packaging materials are commonly made of a polymer layer attached to a metal layer
Data Source
AI summary
An acid resistant adhesive composition, comprising at least one polychloroprene, at least one epoxy silane, at least one amine silane, at least one unsaturated silane, and at least one organic solvent, exhibits excellent initial peel strength and final peel strength after being soaked in electrolyte solution, and shows good acid resistant property.