Laser Powder Coating of Battery Electrodes Without Solvent Drying
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Solution Overview
Problem
Conventional methods for manufacturing battery electrodes, such as slurry casting, are time-consuming (16-40 hours per cycle) and face issues with solvent toxicity and physiochemical changes, requiring improvements in efficiency and safety.
Innovation Solution
A laser-based method using solvent-free powder and controlled laser parameters to coat current collectors, where a laser beam melts the binder on the powder to form electrodes, with parameters like scan frequency and temperature optimized for desired thickness and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If slurry casting method is used to manufacture battery electrodes, then the coating can be formed with binder and solvent, but the manufacturing cycle time is excessively long (16-40 hours)
Solution Approach 1:
The patent extracts and removes the solvent component from the traditional slurry casting process, using only solvent-free powder mixtures. This eliminates the lengthy drying phase (16-40 hours) while maintaining coating integrity through laser-induced binder melting and bonding.
Solution Approach 2:
The patent replaces the conventional thermal drying process with laser beam processing. The laser provides localized heating to melt the binder and fuse the powder mixture to the current collector, reducing the manufacturing cycle from hours to minutes or seconds.
2Object-affected harmful factors
If slurry casting method is used, then the coating can be applied, but solvent toxicity and reactivity issues arise
Solution Approach 1:
The patent completely removes the solvent from the powder mixture, eliminating all toxicity and reactivity issues associated with solvents. The solvent-free approach maintains process feasibility through direct laser heating and binder melting.
Solution Approach 2:
The patent changes the physical state and composition parameters by using solvent-free powder mixtures with optimized particle size distributions and binder content, enabling direct laser processing without solvent-related safety concerns.
3Productivity
If laser beam is used to melt binder in solvent-free powder, then manufacturing time is reduced to 5-20 seconds, but precise control of temperature and scan frequency is required
Solution Approach 1:
The patent implements feedback control systems that monitor laser power, scan speed, and oscillation frequency in real-time, adjusting parameters to maintain optimal binder melting temperature and prevent current collector damage while achieving rapid manufacturing.
Solution Approach 2:
The patent uses dynamic laser beam oscillation at controlled frequencies to distribute heat evenly across the powder layer, preventing localized overheating while ensuring complete binder melting and uniform coating formation during the rapid 5-20 second process.
4Manufacturing precision
If laser power density is increased to achieve desired coating thickness, then coating quality improves, but risk of current collector damage increases
Solution Approach 1:
The patent applies localized heating through controlled laser beam oscillation, concentrating energy only where needed to melt the binder and form the coating, while maintaining lower temperatures in surrounding areas to protect the current collector from thermal damage.
Solution Approach 2:
The patent uses periodic laser beam oscillation at specific frequencies to cycle the heat application, allowing heat diffusion and preventing thermal accumulation that could damage the current collector, while still achieving sufficient binder melting for high-quality coatings.
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 laser-based method significantly reduces manufacturing time to 5-20 seconds per cycle, produces stable coatings without solvent toxicity, and ensures efficient adhesion of active materials to the current collector.
Implementation Method 1
applying the laser beam to the solvent-free powder to melt the binder of the solvent-free powder at said desired temperature to produce a coating on the current collector
Implementation Method 2
melt the binder of the solvent-free powder at said desired temperature
Data Source
AI summary
Producing an electrode by providing a solvent-free powder that includes an electrode active material and a binder, determining a temperature to be produced at a location of application of a laser beam, selecting a scan frequency at which to control oscillation of the laser beam, producing the electrode by feeding, via a powder feeder, the solvent-free powder onto a current collector and concurrently applying the laser beam to the solvent-free powder to melt the binder of the solvent-free powder at the temperature to produce a coating on the current collector.