Electrochemical device with fabric separator

摘要

A polymeric sheet useful as an electrode separator comprises a fabric formed from fibres which have been treated by a graft-polymerisation reaction with a component which renders the fabric hydrophilic. The grafting conditions are such that the said component grafts preferentially on one surface of the fabric compared with the opposite surface, making that surface more hydrophilic than the opposite surface, and that the hydrophilic character of at least the said opposite surface is substantially homogeneous over that surface.