TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The battery excludes an element configured to block an electric current flow in the battery, when a temperature of the battery reaches a predetermined temperature, where the element is a positive temperature coefficient element.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - The cathode includes a cathode active material including a cathode material capable of occluding and releasing lithium. The cathode material includes at least one of a composite oxide containing lithium and a transition metal element, and a phosphoric acid compound including lithium and a transition metal element. The anode has an anode active material layer. A thickness of the anode active material layer after charging is 75 mu m or less. The cathode active material includes two or more cathode materials. The anode includes an anode active material containing one or more anode material capable of occluding and releasing lithium. The anode material includes carbon material, and includes two or more anode materials with different mean particle diameters. The thickness of the anode active material layer before assembly of the battery is 65 mu m or less. The composite oxide is lithium compound of formula (LixM1O2). The phosphoric acid compound is lithium compound of formula (LiyM2PO4). The composite oxide comprises lithium cobalt composite oxide of formula (LixCoO2), lithium nickel complex oxide of formula (LixNiO2), lithium nickel cobalt composite oxide of formula (LixNi(1-z)CozO2), lithium nickel cobalt manganese composite oxide of formula (LixNi(1-v-w)CovMnwO2), and a lithium manganese composite oxide (LiMn2O4) having a spinel-type structure. The phosphoric acid compound is a lithium-iron phosphoric acid compound of formula (LiFePO4), and a lithium-iron manganese phosphoric acid compound of formula (LiFe(1-u)MnuPO4).M1, M2 = transition metal elements;x, y = 0.05-1.10;z = less than 1;v+w = less than 1; andu = less than 1.Preferred Components: The content of one of fluoro ethylene carbonate and difluoro ethylene carbonate is 1-80 mass%, preferably 3-60 mass%. The electrolyte: includes 5 mass% of fluoro ethylene carbonate, and 5 mass% of difluoro ethylene carbonate as solvents; and contains a high boiling point solvent and a low boiling point solvent. The high boiling point solvent includes at least one of cyclic carbonates (preferred), lactones, lactams, and cyclic sulfones. The low boiling point solvent includes at least one of chain carbonates (preferred), chain carboxylates, ketones, ethers, chain amides, and chain carbamates.