Patent ID: 10535893

Abstract:
An insulating porous layer for a nonaqueous electrolyte secondary battery having excellent separator resistance is provided. The porous layer contains an inorganic filler and a resin, a central particle diameter of the inorganic filler is in a range of 0.1 μm to 11 μm, a BET specific surface area per unit area of the inorganic filler is not greater than 100 m2/g, and the value of formula (1) is in a range of 0.10 to 0.40: [1−T/M]  (1) In formula (1), T and M respectively represent a distance by which the insulating porous layer moves in a traverse direction or a machine direction from a starting point of measurement to a point where a critical load is obtained in a scratch test under a constant load of 0.1 N.