Patent ID: 9601740
Date: 2017-03-21
CPC Classifications: H01M,Y02E,Y02P,Y02T

Claim:
1. A composite porous separator having a shutdown function, the composite porous separator comprising: (1) a porous substrate acting as a support and having a first melting point and a first porosity; (2) a first porous polymer web layer that is formed on one side of the porous substrate, and acts as an adhesive layer when in close contact with an opposing electrode; and (3) a second porous polymer web layer that is formed on the other surface of the porous substrate, and is formed of nanofibers of a heat-resistant polymer, wherein the first porous polymer web layer and the second porous polymer web layer have a melting point higher than the first melting point of the porous substrate and a porosity that is the same as or similar to the first porosity of the porous substrate, respectively, wherein the porous substrate has a thickness set in the range of 5-9 μm, the first porous polymer web layer has a thickness set in the range of 2-3 μm, and the second porous polymer web layer has a thickness set in the range of 4-14 μm.