Lithium Metal Anode Adhesive Layer for Stable Collector Bonding
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Solution Overview
Problem
Lithium metal batteries face commercialization challenges due to weak adherence between the negative current collector and active material, leading to electrolyte penetration and increased resistance, which deteriorates battery performance and safety.
Innovation Solution
An adhesive layer comprising a binder and conductive material is introduced between the negative current collector and lithium metal thin membrane to enhance conductivity and adherence, improving the manufacturing method through a wet process for better adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a physical compression method without binder is used to manufacture the negative electrode, then the manufacturing process is simple, but the adherence between the negative current collector and the negative active material is weak
Solution Approach 1:
An adhesive layer comprising a binder and conductive material is introduced between the negative current collector and the lithium metal thin membrane. This adhesive layer acts as an intermediary that simultaneously improves adherence and maintains conductivity, resolving the contradiction between simple manufacturing and reliable adherence.
Solution Approach 2:
The adhesive layer is formed as a composite material combining a binder (for adherence) and conductive material (for electrical conductivity). This composite structure allows the system to achieve both strong bonding and maintained electrical performance, addressing the limitations of using either component alone.
2Device complexity
If no adhesive layer is used, then the device structure is simple, but electrolyte solution penetrates between the current collector and active material causing increased resistance
Solution Approach 1:
The adhesive layer serves as a protective intermediary barrier that prevents electrolyte solution from penetrating between the current collector and active material. This layer blocks the harmful interaction while maintaining the overall structural simplicity of the electrode.
Solution Approach 2:
The adhesive layer is implemented as a thin film structure that provides continuous coverage and protection against electrolyte penetration. The thin film format maintains structural simplicity while effectively preventing the harmful effects of electrolyte intrusion.
3Duration of action of moving object
If volume changes of lithium occur during operation, then the battery operates, but gaps between the current collector and active material gradually increase
Solution Approach 1:
The adhesive layer acts as a flexible intermediary that accommodates volume changes of the lithium metal during charge-discharge cycles. This mediator layer maintains continuous contact between the current collector and active material, preventing gap formation despite volumetric expansion and contraction.
Solution Approach 2:
The adhesive layer is designed with mechanical properties that allow it to adapt to parameter changes (volume changes) of the lithium metal during operation. The binder and conductive material composition enables the adhesive layer to maintain adherence under varying dimensional conditions.
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 improved adherence and conductivity result in enhanced battery lifespan, safety, and capacity retention, suppressing resistance increase during cycling and enabling stable battery operation.
Implementation Method 1
an adhesive layer disposed on one surface or both surfaces of the negative current collector and including a binder
Implementation Method 2
an adhesive layer disposed on one surface or both surfaces of the negative current collector and including a binder and a conductive material
Data Source
Figure 1
Figure 2A
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AI summary
The present invention relates to a negative electrode for a lithium metal battery, a manufacturing method thereof, and a lithium battery including the same. In detail, in an exemplary embodiment of the present invention, to improve conductivity while improving adherence between a negative current collector and a negative active material of the lithium battery, an adhesive layer including a binder and a conductive material between the negative current collector and the negative active material is provided.