| 摘要 |
PURPOSE: A separator of lithium ion secondary battery is provided, which improves stability of the lithium ion secondary battery. And a lithium ion secondary battery using the same is also provided. CONSTITUTION: In the separator of lithium ion secondary battery, void(162) is distributed in the form of an oblique line toward a winding direction. The lithium ion secondary battery comprises an electrode group prepared by winding the separator where the void is distributed in the form of an oblique line toward the winding direction, an anode and a cathode. The direction of the void is 30-40 degree on the basis of machine direction. |
