Patent ID: 9692028
Date: 2017-06-27
CPC Classifications: H01M,Y02E

Claim:
1. A separator for a nonaqueous electrolyte battery comprising a composite membrane including: a porous substrate that contains a thermoplastic resin; and an adhesive porous layer that is provided on at least one side of the porous substrate and contains an adhesive resin, the difference between the Gurley number of the porous substrate and the Gurley number of the composite membrane being 20 sec/100 cc or more and 75 sec/100 cc or less, the difference between the tortuosity of the porous substrate and the tortuosity of the composite membrane being 0.30 or less, the ratio of the standard deviation of the Gurley number of the composite membrane to the mean of the Gurley number of the composite membrane is 0.3 or less.