Micro-Gravure Lithium Coating for Uniform Ultrathin Strip Production
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Solution Overview
Problem
Current methods for producing ultrathin metal lithium strips are complex, costly, and result in poor surface uniformity and low production efficiency, failing to meet industrial requirements for high energy density materials.
Innovation Solution
A gravure coating device comprising a lithium-melting tank, micro-gravure roller, unwinding and winding devices, and a hot pressing system, which transfers molten lithium to a substrate using the micro-gravure roller, ensuring uniform coating and automatic continuous production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional rolling or extrusion methods are used to produce ultrathin lithium strips, then the production process becomes complex with high operational requirements, but the coating uniformity and surface quality remain poor
Solution Approach 1:
The patent replaces traditional mechanical rolling or extrusion systems with a gravure coating system that uses a micro-gravure roller to transfer liquid lithium onto the substrate. This substitution enables precise control of coating thickness and uniformity through the roller's groove geometry rather than complex mechanical pressure and speed coordination, directly resolving the contradiction between manufacturing precision and device complexity
Solution Approach 2:
The patent changes the physical state of lithium from solid (requiring rolling/extrusion) to liquid (enabling gravure coating). By controlling temperature to maintain lithium in liquid state and using the micro-gravure roller's groove depth and spacing parameters, the system achieves uniform ultrathin coating without the complexity of traditional mechanical processes
2Manufacturing precision
If extrusion method with argon gas is used to obtain ultrathin lithium strips, then the production cost increases due to high debugging requirements, but the thickness control becomes difficult
Solution Approach 1:
The patent replaces the complex extrusion system with argon gas pressure control with a gravure coating system. The micro-gravure roller's groove geometry directly determines coating thickness, eliminating the need for complex debugging of gas pressure, extrusion speed, and substrate movement speed coordination. This substitution improves both thickness control and ease of manufacture
Solution Approach 2:
The micro-gravure roller is designed with specific groove dimensions that self-determine the coating thickness. The system automatically achieves consistent ultrathin coating through the roller's geometric parameters without requiring continuous debugging or complex control systems, reducing both cost and operational difficulty
3Productivity
If metal lithium is made into powder for spraying, then the production efficiency improves, but safety hazards increase due to strong reactivity and explosion risk
Solution Approach 1:
The patent uses liquid lithium (intermediate phase between solid and powder) for gravure coating. This phase transition approach allows continuous coating production (improving efficiency) while avoiding the explosion hazards of powder form. The liquid state enables safe handling and continuous processing without the reactivity issues associated with powdered metal lithium
Solution Approach 2:
The micro-gravure roller acts as an intermediary that transfers liquid lithium onto the substrate in a controlled manner. This intermediary system enables continuous production efficiency while the liquid state and controlled transfer mechanism eliminate the safety hazards associated with powder spraying, bridging the gap between safety and productivity
4Ease of manufacture
If lubricant is added during lithium strip production to assist the process, then the production feasibility improves, but the product quality deteriorates due to surface film formation
Solution Approach 1:
The patent extracts and eliminates the lubricant component from the production process entirely. By using liquid lithium's inherent properties and the micro-gravure roller's groove geometry to control the coating process, the system achieves both production feasibility and high surface quality without any lubricant-induced surface films
Solution Approach 2:
The liquid lithium and micro-gravure roller system is self-sufficient, using the lithium's own fluid properties and the roller's geometric features to control the coating process. This self-service mechanism eliminates the need for external lubricants, simultaneously improving ease of manufacture and surface quality
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 device achieves uniform ultrathin metal lithium strips with a thickness of 1-50 μm, improving coating uniformity, work efficiency, and product quality while reducing production costs and complexity.
Implementation Method 1
the lower portion of the micro-gravure roller is immersed in the liquid lithium in the lithium-melting tank for transferring the liquid lithium
Implementation Method 2
One side of the micro-gravure roller is provided with a hot scraper for removing liquid lithium
Implementation Method 3
One side of the micro-gravure roller is provided with a hot scraper for removing liquid lithium, and the end portion of the hot scraper is in contact with the roller surface of the micro-gravure roller
Implementation Method 4
the substrate back roller is arranged diagonally above the micro-gravure roller... the hot pressing device is arranged between the substrate back roller and the winding device
Data Source
AI summary
Provided are a gravure coating device for preparing a large-width ultrathin metal lithium strip and the preparation method, relating to the technical field of preparation of metal lithium materials. The device comprises: a lithium-melting tank (17), a micro-gravure roller (5), a unwinding device, a substrate back roller (7), a hot pressing device and a winding device; wherein the lower portion of the micro-gravure roller (5) is immersed into the liquid lithium in the lithium-melting tank (17); one side of the micro-gravure roller (5) is provided with a hot scraper (6), and the end portion of the hot scraper (6) is in contact with the surface of the micro-gravure roller (5); the substrate back roller (7) is arranged diagonally above the micro-gravure roller (5); the unwinding device is arranged on one side of the substrate back roller (7); the winding device is arranged above the substrate back roller (7); the hot pressing device is arranged between the substrate back roller (7) and the winding device; after passing through the substrate back roller (7) and the hot pressing device, the substrate on the unwinding device is winded onto the winding device. The device is simple in structure and reasonable in design, effectively improves the coating uniformity, and realizes automatic production of ultrathin metal lithium strips with a thickness of 1-50 μm, thereby greatly improving work efficiency and product quality.