Patent ID: 8808884
Filing Date: 2014-08-19
Classification: H01M,Y02E,Y02P

Abstract:
1. A secondary battery comprising: an electrode assembly comprising: a first electrode comprising a first electrode collector and a first electrode coating portion formed on at least one surface of the first electrode collector; a second electrode comprising a second electrode collector and a second electrode coating portion formed on at least one surface of the second electrode collector, the second electrode coating portion facing the first electrode coating portion, an area of the first electrode coating portion being larger than an area of the second electrode coating portion, the second electrode coating portion including lithium titanate oxide; and a separator disposed between the first electrode and the second electrode; a case accommodating the electrode assembly; a protection circuit board coupled to the first and second electrodes of the electrode assembly; and an electrolyte filled in the case, wherein a ratio of a capacity of the second electrode coating portion to a capacity of the first electrode coating portion is no less than 1.2 and no greater than 1.5.