Composite sheet electrode

A composite sheet electrode having a porosity of 20 to 80%, which comprises:

• (a) a composite sheet comprising a mixture of 5 to 95% by weight of an active electrode material and 5 to 95% by weight of heat fusible fibers, wherein said active electrode material is selected from the group consisting of a transition metal oxide, a transitional metal chalcogenide compound other than transition metal oxide, a combination thereof with Li, a graphite compound prepared from carbonized organic compounds, carbon fluoride, graphite and an electroconductive polymer having an electronductivity of 10.sup.-2 S/cm, and wherein said heat fusible fibers have a length of 0.1 to 50 mm and are selected from the group consisting of a polyester, a polyamide, a polyolefin, a polyvinyl alcohol, a synthetic pulp, a polyester fiber covered with a low melting point polymer, a polyamide covered with a low melting point polymer, and mixtures of said fibers, and
• (b) a current collecting material layer laminated on said composite sheet, wherein said current collecting material is selected from the group consisting of carbon black, glassy carbon powder, graphite powder, carbon fiber, metal powder, metal fiber, and mixtures thereof.