| 摘要 |
A secondary battery having improved output characteristics is disclosed. The secondary battery according to the present invention accommodates a cell assembly, which is formed by connecting a plurality of cells in parallel, and an electrolyte together in one packing material, cathodes of a plurality of central cells disposed at a central part of the cell assembly have a loading energy density larger than that of cathodes of a plurality of side cells disposed at a side part, and the cathodes of the central cells have cathode material coating layers formed at surfaces thereof, which are thicker than those formed at surfaces of the cathodes of the side cells. Preferably, the total resistance of the side cells is smaller than the total resistance of the central cells. |
