NOVELTY - A positive electrode (1) forms an anode-mix layer which contains a positive electrode active material, e.g. tin, from a lithium cobaltate-type compound and nickel lithuim cobaltate-type compound, electronic conduction adjuvant such as a carbon material and binder, to flatten one or both surfaces of an electroconductive base that functions as a collector. The active material which substitutes some of cobalt or nickel in the two compounds shall satisfy a mass ratio of 0.04 to 0.8, and density of more than 3.7 grams per cubic centimeter.    USE - For power supply of e.g. portable apparatus of high power consumption, motor vehicle, bicycle, and motorcycle.    ADVANTAGE - Increases load characteristic by increasing capacity. Excellent in invertibility since a favorable charging and discharging cycle characteristic is ensured.    DETAILED DESCRIPTION - The active materials in lithium cobaltate-type compound and nickel lithium cobaltate-type compound include aluminum (Al), manganese (Mn), iron (Fe), magnesium (Mg), silicon (Si), titanium (Ti), zinc (Zn), molybdenum (Mo), vanadium (V), strontium (Sr), tin (Sn), antimony (Sb), tungsten (W), tantalum (Ta), niobium (Nb), germanium (Ge), and barium (Ba). The lithium cobaltate-type compound and nickel lithium cobaltate-type compound, when replaced with any one of the active materials, should satisfy general formula LipCoqMa(1-q)O2 and LixNiyCozMb(1-y-z)O2 where 0.5less than or equal topless than or equal to 1.2, 0not greater than qnot greater than 1, 0.5less than or equal toxless than or equal to 1.2, y+znot greater than 1, ynot less than 0, and znot less than 0. The electronic-conduction adjuvant mixed with the active materials are carbon materials such as carbon black, acetylene black, Ketchen Black, graphite, and carbon fiber that shall have 0.5 to 1.8 mass percent. The binder used to adhere the active materials and electronic-conduction adjuvant include polyvinyldenefluoride-type polymer and rubber-type polymer such as styrene-butadiene rubber (SBR), ethylenepropylenediene rubber and fluororubber and should have 0.1 mass percent or more and provided in the form of a solution dissolved in a dispersion medium, in powder or solvent form.    DESCRIPTION OF DRAWING(S) - The figure shows the top view and the fragmentary longitudinal cross-sectional view of the lithium ion secondary cell.    Positive electrode (1)    Negative electrode (2)    Separator (3)    Battery case (4)    Insulator (5)