The pore size, pore size distribution and total volume
porosity of the separator have a direct influence on the
electrical properties of the separator in the battery [6,7].
All pores which are accessible from the surface of the
separator, will become filled with acid and will contribute
to lower the acid displacement as well as decreasing
the electrical resistance by promoting the ionic transfer.
The advantage of the Amersil separator is that the silica
aggregates are not embedded in a melted polymer matrix,
but only distributed among polymer grains, which renders
the membrane pores perfectly hydrophilic and allows the electrolyte diffusion through the whole separator structure.
Because the extraction pores of the corrugated product are
tortuous, the risk of dendrite growth remains limited, even if
their size is larger than in the standard ribbed separator,
resulting in a much lower electrical resistance