Patent ID: 8394533

Claim:
A secondary battery, comprising: an electrode assembly including a positive electrode having a positive electrode active material layer containing lithium carbonate (Li 2 CO 3 ), a negative electrode having a negative electrode active material layer, and a separator separating the positive electrode from the negative electrode; a can housing the electrode assembly; a cap assembly disposed on the can; and an electrolyte injected into the can, wherein a content of the lithium carbonate (Li 2 CO 3 ) is in the range of 1.0 to 1.5 wt % of the total weight of the positive electrode active material layer, a content of the electrolyte is in the range of 10.8 to 11.93 wt % of the total weight of a bare cell, and an operating pressure for interrupting current by the cap assembly is in the range of 7 to 9 kgf/cm 2 .