Patterned Lithium Metal Electrodes for Dendrite-Resistant Batteries
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Solution Overview
Problem
Existing methods for patterning lithium metal as a negative electrode material in lithium secondary batteries face challenges in achieving uniformity and scalability, leading to non-uniform surface treatment and reduced battery performance and lifespan due to dendrite growth and limited surface area.
Innovation Solution
A method involving forming a uniform intaglio or embossed pattern on a silicon wafer, pressing lithium metal onto it, and separating the patterned lithium metal to create a uniformly patterned surface with controlled shape and size, enabling large-area patterning and improved surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal is used as negative electrode material to achieve high energy density, then capacity is improved, but dendrite growth occurs reducing safety and performance
Solution Approach 1:
The patent applies local quality by creating micropatterns (convex or concave structures) on specific regions of the lithium metal surface. These patterns are formed through mechanical rolling with patterned rollers or chemical etching, creating localized structural variations that control lithium deposition behavior and prevent dendrite formation while maintaining high capacity
Solution Approach 2:
The patent implements preliminary action by pre-forming micropatterns on the lithium metal surface before battery assembly. The patterns are created in advance through rolling or etching processes, preparing the surface to guide uniform lithium deposition during subsequent charging cycles and prevent dendrite growth
2Duration of action of moving object
If mechanical surface treatment using micro needles is applied to increase surface area, then cycle characteristics are improved, but non-uniform treatment reduces performance
Solution Approach 1:
The patent uses copying by transferring the micropattern design from a precision-manufactured roller surface to the lithium metal foil through mechanical rolling. The roller acts as a template that replicates its pattern uniformly across large areas of lithium metal, ensuring consistent micropattern formation without the non-uniformity associated with direct micro-needle treatment
Solution Approach 2:
The patterned roller serves multiple functions: it acts as a pressing tool for mechanical deformation, a template for pattern transfer, and a means for large-area uniform treatment. This single device accomplishes what would otherwise require complex multi-step processing to achieve uniform surface modification
3Productivity
If lithium metal surface is treated to increase surface area, then charging and discharging capacity is improved, but dendrite growth and non-uniformity persist
Solution Approach 1:
The patent applies local quality by creating micropatterns (convex or concave structures) on specific regions of the lithium metal surface. These patterns are formed through mechanical rolling with patterned rollers or chemical etching, creating localized structural variations that control lithium deposition behavior and prevent dendrite formation while maintaining high capacity
Solution Approach 2:
The patent utilizes the hydraulic press to apply uniform pressure during the rolling process, ensuring consistent micropattern formation across the lithium metal surface. The controlled pressure distribution helps achieve uniform deformation and pattern transfer, improving both surface area and treatment uniformity
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 method enhances the reversibility and stability of lithium metal electrodes, improving charging and discharging capacity and efficiency, and extending the battery's lifespan by reducing dendrite growth and non-uniformity issues.
Implementation Method 1
pressing lithium metal onto it, and separating the patterned lithium metal to create a uniformly patterned surface
Implementation Method 2
A negative electrode for a lithium secondary battery and a lithium secondary battery may be manufactured using the same
Data Source
AI summary
A lithium metal is physically pressed to a silicon wafer having a uniform intaglio or embossed pattern formed thereon in advance, or liquid lithium is applied to the silicon wafer and may then be cooled in order to form a uniform pattern on the surface of the lithium metal.