Laminated porous film, separator for lithium cell and cell

摘要

Provided is a laminated porous film having excellent shutdown characteristics and breakdown characteristics, good tearing strength and dimensional stability, and B activity. The laminated porous film comprises layer A, the main component of which is a polypropylene resin, and layer B which contains a polyethylene resin, and the ratio of the rearing strength (H MD ) in the machine direction(MD) of the laminated porous film and the tearing strength (H TD ) in the transverse direction(TD)of the laminated porous film with respect to the machine direction (H MD ) (H TD ) is 0.08 to 2.0.