Patent ID: 6589690
Filing Date: 2003-07-08
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
A secondary battery comprising:an electrode group comprising a positive electrode, a negative electrode and a separator, said positive electrode comprising a positive electrode collector and a positive electrode layer held to said positive electrode collector, said negative electrode comprising a negative electrode collector and a negative electrode layer held to said negative electrode collector, and said separator interposed between said positive electrode layer and said negative electrode layer; a nonaqueous electrolyte held by said electrode group; and a jacket housing said electrode group and having a thickness of not more than 0.3 mm; wherein said positive electrode, said negative electrode and said separator are formed integrally, and the peeling strength between said positive electrode layer and said separator is lower than the peeling strength between said positive electrode layer and said positive electrode collector, while the peeling strength between said negative electrode layer and said separator is lower than the peeling strength between said negative electrode layer and said negative electrode collector; and wherein the peeling strength between said negative electrode layer and said separator is 0.01 gf/cm or more and 5 gf/cm or less, and the peeling strength between said positive electrode layer and said separator is 0.1 gf/cm or more and 5 gf/cm or less.