TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The lithium-titanium composite oxide is lithium-titanium oxide. The lithium composite oxide is lithium-manganese composite oxide. The lithium-manganese composite oxide is a part of substituted manganese with at least one metal comprising titanium, lithium, aluminum, nickel, chromium or magnesium. The lithium composite oxide having a spinel-type crystal structure is formulated at 1-20 wt.%, preferably 5-10 wt.% based on the total amount of the lithium composite oxide and lithium-titanium composite oxide. The lithium composite oxide is of formula (Li(1+p)(Mn(1-x)Mx)2O4).M = Al, Ni or Mg (all preferred), Ti, Li or Cr;x = 0-0.5, preferably 0-0.3; andp = 0-1. EXAMPLE - Lithium-iron phosphate powder (91 wt.%), acetylene black (2.5 wt.%), graphite (3 wt.%) and polyvinylidene fluoride (3.5 wt.%) were added in N-methylpyrrolidone and mixed to prepare slurry. This slurry was applied to an aluminum foil and dried, followed by pressing to obtain a positive electrode. A lithium-titanium oxide (99 wt.%) powder and lithium-manganese composite oxide (1 wt.%) having spinel-type crystal structure were mixed to obtain a mixed active material. In succession, mixed active material (85 wt.%), graphite (5 wt.%), acetylene black (3 wt.%) and polyvinylidene fluoride (7 wt.%) were added to N-methylpyrrolidone and mixed to prepare slurry. The slurry was applied to a copper foil and dried, followed by pressing to obtain a negative electrode. The positive electrode, a separator made of a polyethylene porous film, the negative electrode and the same separator were laminated and then, spirally coiled so that the negative electrode was positioned on the outermost periphery to obtain an electrode group. Ethylene carbonate and methylethyl carbonate were mixed in a ratio of 1:2 by volume to prepare a mixed solvent. Lithium hexafluorophosphate (1 mol/l) was dissolved in the mixed solvent to prepare a nonaqueous electrolyte solution. The electrode group and the electrolyte solution were housed in a bottomed cylindrical container. Then, one end of the negative electrode lead was connected to the negative electrode of the electrode group and the other was connected to the bottomed cylindrical container serving as the negative electrode terminal. In succession, an insulation seal plate in which the positive electrode terminal fitted in the center was prepared. One end of the positive electrode lead was connected to the positive electrode terminal and the other was connected to the positive electrode of the electrode group. Then, the insulation seal plate was fitted in the upper opening of the container to obtain the nonaqueous electrolyte secondary battery.