Abstract: Disclosed is an alkaline storage battery which exhibit exceptional charge/discharge and cycle life characteristics by improved current collection and active material retention of the electrode substrate. The electrode comprises a substrate composed of a conductive core material and fibrous nickel members unitary sintered on both surfaces of the conductive core material, and a layer of an active material filled into the substrate. The fibrous nickel members of the substrate are bent or curved at least at their tip ends inside the active material layer to retain the active material.

Abstract: A solid polymer electrolyte according to the present invention comprises a polymer (A), and a liquid electrolyte (B) composed of a lithium salt and an aprotic solvent, optionally and a ceramic filler (C). The polymer (A) is poly(acrylonitrile-methyl methacrylate), poly(acrylonitrile-methyl methacrylate-oligooxyethylene ethylether methacrylate) or poly(acrylonitrilc-methyl methacrylate-styrene). The polymer (A) is poly(acrylonitrile methyl methacrylate) containing acrylonitrile of 10.about.90 mol %, preferably 26.about.46 mol %, poly(acrylonitrile-methyl methacrylate-oligooxyethylene ethylether methacrylate) containing acrylonitrile of 20.about.80 mol %, methyl methacrylate of 20.about.80 mol % and oligooxyethylene ethylether methacrylate of 5.about.20 mol %, and poly(acrylonitrile-methyl methacrylate-styrene) containing acrylonitrile of 10.about.80 mol %, methyl methacrylate of 10.about.60 mol % and styrene of 5.about.50 mol %.