TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: In the secondary battery, the contact with the electrolyte is arranged to cause the base layer to change in shape so that the portion of the base layer is arranged to increase in thickness so as to adhesively contact the inner surface of the case. The tape further comprises an adhesive layer formed on an outer surface of the electrode assembly, where the base layer is formed over an outer surface of the adhesive layer. In the secondary battery, after contact with the electrolyte, the base layer comprises a first region and a second region, where the first region is thicker than the second region, and the first region adhesively contacts the inner surface of the case. The base layer is formed at least partially of an oriented polystyrene film. The electrode assembly comprises a first electrode, a separator and a second electrode which are sequentially stacked and wound, where the separator is disposed between the first and second electrodes, an outermost finishing part is formed on a winding end of the separator, and optionally the tape is arranged to cover the outermost finishing part or is attached to the outermost finishing part. The base layer has a thickness of 10-50 mu m. The tape is attached to substantially the entire outer circumference of the electrode assembly. In the secondary battery, when the dimension of the entire outer circumference of the electrode assembly is defined as 1, the dimension of the tape attached to the outer circumference of the electrode assembly is defined as greater than or equal to 0.5, optionally more than 0.5 and less than 1. The tape is attached to parts other than an upper end part and lower end part of the outer surface of the electrode assembly. The width of the tape is at least 20% of a width of the electrode assembly. The tape further comprises an auxiliary base layer and an auxiliary adhesive layer interposed between the base layer and adhesive layer, where the auxiliary base layer is arranged to contact the adhesive layer and auxiliary adhesive layer, and the auxiliary adhesive layer is arranged to contact the base layer and auxiliary base layer. The tape is arranged to exhibit an adhesion force of at least 1 kgf/cm2 after contacting with the electrolyte.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The electrolyte comprises a carbonate based solvent (10-60 wt.%) including dimethyl carbonate electrolyte, diethyl carbonate or dipropyl carbonate. EXAMPLE - Lithium cobalt dioxide (positive electrode active material), polyvinylidene fluoride (binder) and carbon (conductive material) were mixed at a weight ratio of 92:4:4, respectively and the mixture was dispersed in N-methyl-2-pyrrolidone to form a positive electrode slurry. The positive electrode slurry was coated with an aluminum foil having a thickness of 20 mu m, dried and rolled to form a positive electrode. Artificial graphite (negative electrode active material), styrene-butadiene rubber (binder) and carboxymethyl cellulose (thickener) were mixed at a weight ratio of 96:2:2, respectively and the mixture was dispersed in water to form a negative electrode slurry. A copper foil having a thickness of 15 mu m was coated with the negative electrode slurry, dried and rolled to form a negative electrode. A polyethylene/polypropylene porous film having a thickness of 20 mu m was used as a separator. The separator was placed between the cathode and the anode. Then, the separator, the cathode and the anode were wound, and a tape was wound around them (so that the tape includes a winding end) to form an electrode assembly. A 32 mu m thick oriented polystyrene film coated with a 15 mu m thick poly(methylmethacrylate) adhesive was used as the tape. An electrode assembly having a longer diameter of 17 mm and a shorter diameter of 16.56 mm was used. Assuming that a length of the entire outer circumference of the electrode assembly was 52 mm, 52 mm of the tape was attached to the outer surface of the electrode assembly including upper and lower end parts of the electrode assembly. Then an organic solvent mixture of ethylene carbonate, dimethyl carbonate, propylene carbonate and fluorobenzene (with a volumetric ratio of 30:55:5:10), in which 1.1 M of lithium hexafluorophosphate was dissolved, was used as the non-aqueous electrolyte. The electrode assembly wound by a jelly-roll method was inserted in a cylindrical aluminum battery case, and electrolyte was injected into the case and sealed to form the secondary battery.