TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The protective layer comprises conductive material (ketjen black, acetylene black, graphite or coke powders) or inorganic particles (aluminum oxide, silicon dioxide, zirconium dioxide, titanium dioxide or magnesium oxide).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: Solvent of electrolyte solution is non-aqueous solvent selected from ethylene carbonate, propylene carbonate, butylene carbonate, trifluoropropylene carbonate, gamma -butyrolactone, gamma -valerolactone, sulfolane, 1,2-dimethoxyethane, 1,2-diethoxyethane, tetrahydrofurane, 2-methyltetrahydrofurane, 2-methyl-1,3-dioxolan, dioxolan, fluoroethyl methyl ether, ethylene glycol diacetate, propylene glycol diacetate, ethylene glycol dipropionate, propylene glycol dipropionate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, dipropyl carbonate, methyl isopropyl carbonate, ethyl isopropyl carbonate, diisopropyl carbonate, dibutyl carbonate, acetonitrile, fluoroacetonitrile, alkoxy- and halogen-substituted cyclic phosphazenes or chain phosphazenes (ethoxypentafluorocyclotriphosphazene, diethoxytetrafluorocyclotriphosphazene or phenoxypentafluorocyclotriphosphazene), phosphate esters (triethyl phosphate, trimethyl phosphate or trioctyl phosphate), borate esters (triethyl borate or tributyl borate), N-methyloxazolidinone or N-ethyloxazolidinone.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The binder is binder having an ester linkage, and rubber selected from methacrylate ester-acrylate ester copolymer, styrene-acrylate ester copolymer, acrylonitrile-acrylate ester copolymers, polyvinyl acetate, polyvinylidene fluoride, fluorine-containing resins (polytetrafluoroethylene, styrene butadiene rubbers, acrylic resins, polyolefin resins or polyvinyl alcohol) nitrogen-containing resins (polyamide, polyimide or polyamideimide), cross-linked polymers of cellulose and acrylamide and cross-linked polymers (cellulose or chitosan pyrrolidone carboxylate), polysaccharide polymers (chitosan or chitin).