Patent ID: 9666909
Date: 2017-05-30
CPC Classifications: H01M,Y02E,Y02P,Y02T

Claim:
1. A lithium secondary battery configured to have a structure in which an electrode laminate is mounted in a case in a sealed state, wherein the electrode laminate comprises: a positive electrode having a positive electrode material coating layer formed on a positive electrode current collector; a negative electrode having a negative electrode material coating layer formed on a negative electrode current collector; and a porous polymer film interposed between the positive electrode and the negative electrode, wherein the positive electrode, the negative electrodes, and the porous polymer films are laminated in a height direction on the basis of a plane such that the negative electrodes constitute outermost electrodes of the electrode laminate, and the positive electrode material coating layer has a larger coating area than the negative electrode material coating layer, wherein the lithium secondary battery has a capacity retention rate of 70% or higher after 100 cycles, in each of which the lithium secondary battery is charged at a charging rate of 1 C and the lithium secondary battery is discharged at a discharging rate of 1 C at a temperature of 25° C.