Patent ID: 11901578
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 4:
5. The separator of claim 1, wherein a transfer rate of a positive active material or a negative active material into the separator after charge and discharge of Equation 1 is greater than or equal to 60%:

Transfer rate (%)=(A1/A0)×100  [Equation 1]

wherein, in Equation 1, A0 denotes an entire area of a negative electrode or a positive electrode and A1 denotes an area of the positive active material or the negative active material transferred into the separator when charge, discharge, and charge are sequentially performed after the positive electrode, the separator, and the negative electrode are sequentially stacked to form an electrode assembly, first compressing the electrode assembly at 20° C. to 110° C., for 1 to 5 seconds, and at a force of 1 to 30 kgf/cm2, injecting an electrolyte solution to the compressed electrode assembly, and second compressing the same at 60° C. to 110° C., for 30 seconds to 180 seconds, at a force of 1 to 30 kgf/cm2,
1) charge: 4.35 V, 0.2 C, 50 mA cut-off, 5 hours,
2) discharge: 0.2 C, 3 V cut-off, 5 hours, and
3) charge: 0.5 C, 4 V cut-off, 2 hours.