NOVELTY - An energy storage device has a printed current collector layer (1,6) comprising nickel flakes and a current collector conductive carbon additive, and a printed electrode layer (2,5) printed over the current collector layer. The printed electrode layer comprises an ionic liquid and an electrode conductive carbon additive. The ionic liquid includes a cation chosen from e.g. 1-ethyl-3-methylimidazolium, butyltrimethylammonium, 1-butyl-3-methylimidazolium, 1-methyl-3-propylimidazolium, and 1-hexyl-3-methylimidazolium, and an anion chosen from e.g. iodide, chloride, bromide, and nitrate.    USE - Energy storage device e.g. zinc-manganese dioxide battery (claimed) and zinc carbon battery. Uses include but are not limited to electronic device in consumer market, miniature medical device, safe pass cards, skin care products, magazine insert, lights and sounds in greeting cards, and light-emitting diode lights.    ADVANTAGE - The printed energy storage device having desired form-factor is economically manufactured by a simple process.    DETAILED DESCRIPTION - An energy storage device has a printed current collector layer comprising nickel flakes and a current collector conductive carbon additive, and a printed electrode layer printed over the current collector layer. The printed electrode layer comprises an ionic liquid and an electrode conductive carbon additive. The ionic liquid includes a cation chosen from 1-ethyl-3-methylimidazolium, butyltrimethylammonium, 1-butyl-3-methylimidazolium, 1-methyl-3-propylimidazolium, 1-hexyl-3-methylimidazolium, choline, ethylammonium, tributylmethylphosphonium, tributyl(tetradecyl)phosphonium, trihexyl(tetradecyl)phosphonium, 1-ethyl-2,3-methylimidazolium, 1-butyl-1-methylpiperidinium, diethylmethylsulfonium, 1-methyl-1-propylpiperidinium, 1-butyl-2-methylpyridinium, 1-butyl-4-methylpyridinium, and 1-butyl-1-methylpyrrolidinium, and an anion chosen from tetrafluoroborate, tris(pentafluoroethyl)trifluorophosphate, trifluoromethanesulfonate, hexafluorophosphate, ethyl sulfate, dimethyl phosphate, methansulfonate, triflate, tricyanomethanide, dibutylphosphate, bis(trifluoromethylsulfonyl)imide, bis-2,4,4-(trimethylpentyl)phosphinate, iodide, chloride, bromide, and nitrate. An INDEPENDENT CLAIM is included for fabrication of energy storage device.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of zinc-manganese dioxide battery.    Current collector layers (1,6)    Electrode layers (2,5)    Intermediate layer (3)    Polymer insulator layer (7)    Zinc-manganese dioxide battery (20)