I am using wet method to fabricate cathode for a lithium ion capacitor.
The active materials are AC and LFP, plus AB as conductive additive and PVDF as binder (wt. ratio of 0.25:0.75:0.1:0.1 respectively).
I mixed these materials using stirring magnets over night and coated it using Dr. Balding technique (~ 100 micron thick).
My film was dried in oven initially @ 85 C. film was extremely cracked both two times at this stage. First time I suspected if the slurry was not mixed properly so I switched from using pestle and mortar to stirring magnet mixing. But I got severe cracks again.
If you have come across such a problem and have any tips, I would be grateful if you can share it with me here.
Cheers,
Roya
I did not use vac-oven directly since my coated layer was not viscous to stand firmly in vac-oven without the liquid part flowing throughout the surface. So, I dried it in ambient temperature inside fume hood over night and then placed it in oven . after dried fully, punched and put them in vac-oven.
Is there a trend as per ratio of materials for making electrodes? as well as for mixing the materials?
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