| abstract |
An embodiment of the present invention provides a separator for a non-aqueous secondary battery containing: a porous layer that is provided on only one side of the porous substrate, and that contains a resin having at least one bonding group selected from the group consisting of an amide bond, an imide bond, and a sulfonyl bond, in which, in the porous substrate, an absolute value of a difference between a temperature of an endothermic peak observed at from 120°C to 145°C in a temperature raising process 1, and a temperature of an endothermic peak observed at from 120°C to 145°C in a temperature raising process 2, is 1.50°C or higher in DSC measurement when the temperature raising process 1 of continuously raising the temperature from 30°C to 200°C at a temperature change rate of 5°C/min in a nitrogen atmosphere, and the temperature raising process 2 of lowering the temperature from 200°C to 30°C and raising the temperature from 30°C to 200°C, are performed. |