Lithium Thermal Spraying for Rapid Electrode Doping
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Solution Overview
Problem
Conventional lithium ion doping processes for lithium ion capacitors are time-consuming, reducing production efficiency due to the lengthy process of uniformly doping carbon materials with lithium ions.
Innovation Solution
An electrode manufacturing apparatus and method that utilize a processing chamber with a lithium thermal spraying unit to form a lithium thin film on the electrode material by melting and spraying lithium-containing powder in a rare gas atmosphere, significantly reducing doping time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lithium ion doping process is used, then uniform doping of carbon material with lithium ion is achieved, but doping time is excessively long (several days)
Solution Approach 1:
The patent changes the physical state of lithium from ionic form in electrolyte to metallic powder form, and changes the process from diffusion-based doping to thermal spraying deposition. This parameter change transforms a slow diffusion process into a rapid coating process, reducing doping time from several days to minutes while achieving uniform distribution through controlled powder spray parameters
Solution Approach 2:
The patent replaces the chemical diffusion mechanism with a thermal-mechanical spraying process. By using thermal energy to melt lithium-containing powder and kinetic energy from gas pressure to propel the molten material, the process achieves rapid lithium deposition without relying on slow ionic diffusion, thus resolving the time-uniformity contradiction
2Productivity
If lithium-containing powder is melted and sprayed, then doping time is greatly reduced, but spontaneous ignition of lithium may occur
Solution Approach 1:
The patent employs an inert gas atmosphere (such as argon or nitrogen) throughout the thermal spraying process. This inert environment prevents oxygen from contacting the molten lithium-containing powder, eliminating the risk of spontaneous ignition while allowing the high-temperature melting and spraying process to proceed at high speed, thus achieving both high productivity and safety
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
This approach allows for rapid lithium doping of electrode materials, enhancing production efficiency and preventing spontaneous ignition of lithium by using a rare gas atmosphere.
Implementation Method 1
at least one heating gas supply unit configured to supply a heating gas that melts the lithium-containing powder discharged from the lithium-containing powder supply unit
Implementation Method 2
preventing spontaneous ignition of lithium by using a rare gas atmosphere
Implementation Method 3
doping the electrode material with the lithium by forming a lithium thin film on the electrode material of the electrode sheet loaded into the processing chamber while melting and spraying lithium-containing powder
Data Source
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AI summary
A time for doping an electrode material on an electrode sheet with a lithium ion can be reduced. The electrode manufacturing apparatus includes a processing chamber 200 to and from which the electrode sheet is loaded and unloaded; a rare gas supply unit 230 configured to introduce a rare gas into the processing chamber; an exhaust device 220 configured to exhaust an inside of the processing chamber to a certain vacuum level; and a lithium thermal spraying unit 210 configured to dope a carbon material C with the lithium ion by forming a lithium thin film on the carbon material of the electrode sheet W loaded into the processing chamber while melting and spraying lithium-containing powder.