TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Composition: The unit cell comprises a several unit cells, and capacity variation between the unit cells is compensated. The non-aqueous electrolyte secondary battery has a metal electrode (9) for gasification.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The metal electrode contains nickel, copper, iron, and/or stainless. The cathode contains a lithium-containing titanium oxide as a cathode material. The lithium-containing titanium oxide contains compositional formula: Li3+3xTi6-3xO12. The lithium-containing titanium oxide comprises a mixture of crystal particles having a particle size of 0.1-8 microns and secondary particles of the crystal particles having a particle size of 2-30 microns. The cathode comprises a current collector containing aluminum or its alloy. The anode contains a spinel lithium-containing manganese composite oxide containing any one of compositional formula: Li1+xMn2-x-6-yAyO4, Li1-xM2-xO4 (where x is greater than 0) and Li1+xMn2-x-yAyO4, or a layer-structured lithium complex oxide containing compositional formula: Li1+a(Me)O2, preferably Li1+a(Ni1/2-zMn1/2-zCo2z)O2 or Li3+3xTi6-3xO12, as an anode active material.x=0-1/3;y=0-0.6;a=0-0.2;z=less than or equal to1/6;A=aluminum, nickel or iron;Me=transition metal containing nickel and manganese, iron, cobalt, titanium, or copper;andM=manganese.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: Portion(s) of the non-aqueous electrolyte is gasified in the proximity of the cathode. Portion of the non-aqueous electrolyte is gasified in the range of 1.5 V to 0.3 V relative to a lithium metal. The non-aqueous electrolyte contains a nitrile compound as a solvent, or methyl acetate, methyl butyrate, or gamma-butyrolactone as a solvent. The nitrile compound is a mononitrile compound. The mononitrile compound is acetonitrile or propionitrile. The nitrile compound further contains a dinitrile compound. The dinitrile compound is malononitrile, succinonitrile, glutaronitrile, or adiponitrile.