I think, there is no any written amount. You need to optimized this. Keep making and simultaneously check their electrochemical performances, if you want to really study any specific characteristics with the effect of NMP.

The amount of NMP depends on you requirement:

1. Electrode density 2. Electrode formulation recipe 3. Slurry weight

Here is the graph which will give some idea how much NMP is require to make electrode.

Thanks you so much for kind support.

with regards