Lithium Metal Battery Anode Primer Layer Adhesion
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Solution Overview
Problem
Lithium metal batteries face challenges in manufacturing due to the high reactivity of negative electrode active materials, leading to weak adhesion between the current collector and the active material, which results in increased ohmic resistance and reduced battery performance, particularly when using the rolling method.
Innovation Solution
A primer layer comprising epoxy resin and silver (Ag) conductive filler is introduced between the negative electrode current collector and the lithium metal thin film to enhance adhesion and conductivity, reducing the likelihood of foreign substance penetration and improving the overall manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the rolling method is used to manufacture the negative electrode, then process cost is reduced and foreign substance contamination is minimized, but adhesion between the current collector and active material becomes weak
Solution Approach 1:
A primer layer comprising epoxy resin and silver conductive filler is introduced as an intermediary between the current collector and lithium metal active material. This primer layer serves as a mediator that enhances adhesion while maintaining the benefits of the rolling method, resolving the contradiction between ease of manufacture and adhesion strength.
Solution Approach 2:
The primer layer is formulated as a composite material combining epoxy resin (for adhesion) and silver conductive filler (for conductivity). This composite structure allows the primer layer to simultaneously provide strong bonding to both the current collector and active material while maintaining electrical conductivity, thus improving adhesion without compromising the rolling process advantages.
2Ease of manufacture
If the rolling method is used to manufacture the negative electrode, then process cost is reduced, but ohmic resistance increases due to weak adhesion and gaps
Solution Approach 1:
The primer layer acts as an intermediary that eliminates gaps between the current collector and active material, ensuring continuous electrical contact. This mediator prevents electrolyte penetration and maintains low ohmic resistance while preserving the cost-effective rolling manufacturing method.
Solution Approach 2:
The primer layer changes the interfacial properties between the current collector and active material by providing a chemically and mechanically bonded interface. This parameter change in interfacial adhesion and conductivity directly reduces ohmic resistance while maintaining the advantages of the rolling process.
3Strength
If a primer layer with epoxy resin and Ag conductive filler is introduced, then adhesion and conductivity are improved, but device complexity increases
Solution Approach 1:
The primer layer is applied locally only at the interface between the current collector and active material where adhesion is needed, rather than throughout the entire electrode structure. This localized application improves adhesion and conductivity at the critical interface while minimizing the overall structural complexity and material usage.
Solution Approach 2:
The primer layer is applied in advance during the electrode manufacturing process, before the active material is fully assembled. This preliminary action integrates the adhesion enhancement into the manufacturing workflow without requiring additional complex assembly steps, thus improving adhesion while limiting complexity increase.
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 primer layer significantly improves the adhesion and conductivity of the negative electrode, leading to enhanced lifespan and output characteristics of the lithium metal battery, while also reducing process costs and minimizing contamination.
Implementation Method 1
a primer layer including an epoxy resin and a Ag conductive filler, the primer layer disposed on one surface or both surfaces of the negative electrode current collector
Implementation Method 2
a primer layer including an epoxy resin and a Ag conductive filler
Data Source
AI summary
A negative electrode for a lithium metal battery, a method of manufacturing the same, and a lithium metal battery including the same are provided.Specifically, one embodiment of the present invention provides a negative electrode for a lithium metal battery, the negative electrode including: a negative electrode current collector; a primer layer including an epoxy resin and a Ag conductive filler, the primer layer disposed on one surface or both surfaces of the negative electrode current collector; and a lithium metal (Li-metal) thin film disposed on the primer layer.