When we coated the separator with different kind of materials to block the poly-sulfides, then after cycling we got enough poly-sulfides deposited on the separator. Will the solid deposit onto the separator blocks the pores and slow down the lithium diffusion?
In my opinion, it could be. You could do EIS on a pristine cell and the same cell after cycling. If the bulk resistence part increases significantly, it might suggest the pores in the seperator being blocked. Good luck!
Thanks for comment.
Sometimes from EIS the resistance is not significantly increased, but we can see deposition of poly-sulfides via SEM image of separator.
can we consider that it still have enough space for electrolyte infiltration and Li ions transportation?
It depends on many things for example porosity and conductivity of the material used on top of the separator . If material is not porous and conductive enough it can cause the bulk resistance of the cell to rise
If the carbon in the separator is in good contact with coin cell case/cathode, there can be electron conduction leading to reulilization of active material
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