Hi friends,
can anyone tells about the preferred drying method for lithium ion batteries? Please suggest the drying method which do not cause pulverization and cracking of materials.
Regards,
Jegatheesh
Are you asking about drying electrodes after depositing the carbon/binder slurry?
In my experience, it depends on what binder/solvent you use, the thickness of the electrode, and even the electrode material. It will take some trials to find the right parameters. I have had the best luck with thinner electrodes, the thicker electrodes will crack and peel away form the current collector when drying. Also, I prefer to use CMC/water binder solution than PVDF/NMP, but some materials are water sensitive or if you are making aqueous batteries then you cannot use CMC.
After doctor blading, I usually let my electrodes dry in air for several hours or overnight, then I will vacuum dry them between 80 - 120 C. If I use CMC/water they dry faster.
Dear zachary,
can you tell the difference between vacuum drying & laser cutting? Have you ever tried laser drying or annealing?
Vallivel Jegatheesh, I have not heard of laser cutting/drying for electrode preparation. I work with small scale batteries for research, perhaps this technique is in industry?
Hi Zachary,
I read this from an article. In that they have mentioned about the laser drying and different types of laser drying. It is not for industry scale and it is pretty expensive
Hi Vallivel Jegatheesh ,
As Neale pointed out many factors will influence such as Binder, Solvent, Quality of the Spacer and thickness of the electrode coating. I generally dry in vacuum oven at 80 C for five hours. I have ever encountered any issues which you've mentioned. I've no idea about Laser drying.
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