Secondary battery and method for manufacturing the same

A secondary battery comprising an electrode assembly wherein the electrode assembly in a multilayer structure comprises:

• a first unit electrode layer consisting of a plurality of first electrodes, wherein each of the first electrodes are directly connected to adjacent first electrodes, and each of the first electrodes consists essentially of a first electrode mixture having a solid shape without a collector;
• a second unit electrode layer consisting of a plurality of second electrodes, wherein each of the second electrodes are directly connected to adjacent second electrodes, wherein each of the second electrodes consists essentially of a second electrode mixture having a solid shape without a collector;
• a separator layer interposed between the first unit electrode layer and the second unit electrode layer;
• and
• an electrode tab comprising:
• a plurality of first electrode tabs attaching to a side surface of the first unit electrode;
• and
• a plurality of second electrode tabs attaching to a side surface of the second unit electrode,
• the plurality of first electrodes is a positive electrode, and the plurality of second electrodes is a negative electrode.