Production of a cell electrode system

An electrode system comprised predominantly of electrochemically active material, said active material being encradled throughout a porous fiber-containing polymeric composition with maximized accessibility of the active material, and said system having been developed in the presence of a polymeric removable pore-former and consisting essentially, by weight, of about 0.5 to about 25% fibrillated polymer, up to about 25% conductive carbon, about 0.5% to about 20% supporting-contributing polymer and the balance essentially electrode active material, said electrode system having a porosity of about 70% to about 80% by volume and structural integrity, and being in the form of an unsintered, thin, porous, flexible sheet, said electrode system being further characterized in that it is comprised of discrete polymeric fibers throughout the electrode system, said fibers having been developed by a substantially dry processing technique in the presence of at least one of the components selected from the electrode active material, the support-contributing polymer and the pore-former, and said porosity, being interconnecting and having been developed by removal of the pore-former after the formation of the sheet.