Patent ID: 8017262
Filing Date: 2011-09-13
Classification: H01M,Y02E,Y02P,Y02T

Abstract:
1. A lithium secondary battery comprising: a wound electrode group, a non-aqueous electrolyte and a battery case housing said wound electrode group and said non-aqueous electrolyte, said wound electrode group including a positive electrode, a negative electrode and a separator layer interposed between said positive electrode and said negative electrode, wherein an end-of-charge voltage and an end-of-discharge voltage are set in such a manner that said electrode group has an energy density of not less than 700 Wh/L, said separator layer includes a porous heat-resistant layer and a porous resin membrane, said porous heat-resistant layer is adhered on a surface of said positive electrode, said negative electrode includes at least one selected from the group consisting of a lithium metal and a substance capable of being alloyed with lithium, said separator layer has a thickness of 10 to 20 μm, said porous heat-resistant layer has a thickness of 1 to 5 μm, and said porous resin membrane has a thickness of 8 to 18 μm.