I have tried to make porous carbon electrode for LIB.

the slurry was mixed with carbon black and PVDF in NMP.

(Porous carbon : carbon black : PVDF = 85:5:10 w/w)

In order to compare the electrochemical characteristic depend on the crystallinity, porous carbon was heat-treated at high temp.(2500 C, graphitization treatment).

The slurry of non-heated porous carbon was well adhered to the copper foil, also artificial graphite electrode was well prepared as same condition. However, only graphitization treated porous carbon sluury was not adhered to the copper foil. Even, the amount of binder in the slurry was increased to 20 %, it was not adhered.

My PVDF binder shows good adhesion with copper foil.

I coated my PVDF binder on copper foil, which showed good bonding.

It seems to cohesion between the active materials and carbon blacks looks good. Only the coated slurry layer was stripped from the copper foil...

So, my questions are

1. Why only the coated slurry layer is stripped from the copper foil?

(I think that viscosity of binder and slurry was no problem...)

2. Usually PVDF binder for carbon materials, polyimide (PI) binder for Si materials, PI binder is not good for carbon materials?