Lithium Electrode Laser Cutting with Vacuum Adsorption
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Solution Overview
Problem
Current methods for manufacturing lithium electrodes are inefficient and unsuitable for producing high-quality, precise electrodes required for lightweight, miniaturized lithium secondary batteries, due to the high reactivity and ductility of lithium metal, which leads to instability and reduced capacity.
Innovation Solution
A lithium electrode manufacturing apparatus featuring a cutting stage with adsorption holes and unit electrode pattern grooves, combined with laser irradiation, allows for precise cutting and improved processability of lithium metal films into unit electrodes, minimizing burrs and enabling mass production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cutting methods (mechanical cutting or coating-based laser cutting) are used for lithium metal electrodes, then the manufacturing process is simple, but the cutting precision is poor and burrs are generated due to the high ductility and reactivity of lithium metal
Solution Approach 1:
The cutting stage is segmented into multiple functional zones: a vacuum adsorption zone with holes for securing the lithium metal film, and a laser cutting zone with grooves for precise cutting. This segmentation allows each zone to perform its specific function optimally, preventing the film from moving during cutting while maintaining process simplicity
Solution Approach 2:
A vacuum adsorption field is introduced as an intermediary mechanism between the cutting stage and the lithium metal film. The vacuum field temporarily secures the flexible lithium film to the cutting stage during the cutting process, preventing movement and burr formation without requiring complex mechanical clamping structures
2Quantity of substance
If lithium metal is used as negative electrode active material, then the theoretical capacity is high (3,860 mAh/g), but the volume expands by about 4 times during charging, causing active materials to differentiate and drop off, reducing capacity and stability
Solution Approach 1:
The lithium metal is formed into a thin film structure that can flexibly accommodate volume changes during charging and discharging. The thin film structure, combined with vacuum adsorption during processing, prevents cracking and material detachment that would otherwise occur with conventional rigid electrode structures experiencing 4x volume expansion
Solution Approach 2:
The vacuum adsorption mechanism acts as a preventive measure that secures the lithium metal film to the cutting stage before cutting occurs. This pre-securing prevents movement and potential damage during the cutting process, cushioning against the inherent instability of lithium metal processing
3Manufacturing precision
If laser cutting is used without vacuum adsorption, then the manufacturing process is simple, but the lithium metal film moves during cutting due to high ductility, generating burrs and reducing cutting quality
Solution Approach 1:
The vacuum adsorption system provides self-service by automatically securing the lithium metal film to the cutting stage without requiring external manual intervention or complex mechanical clamping. The vacuum field naturally adapts to the film position and secures it in place, enabling both high cutting quality and mass production capability
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 apparatus achieves excellent cutting quality and processability, producing precise lithium electrodes that enhance the performance and reliability of lithium secondary batteries by minimizing damage and burrs, facilitating mass production.
Implementation Method 1
a laser irradiation portion for irradiating a laser to one surface of the lithium metal film to cut the lithium metal film into a plurality of unit electrodes
Implementation Method 2
a cutting stage having a plurality of adsorption holes and a plurality of unit electrode pattern grooves formed on an upper surface thereof
Data Source
AI summary
The present invention relates to an apparatus and a method for manufacturing a lithium electrode, comprising a cutting stage, a laser irradiation portion and a lithium metal film supply portion, in which a plurality of adsorption holes and a plurality of unit electrode pattern grooves are formed on the upper surface of the cutting stage.