SEPARATOR AND NONAQUEOUS SECONDARY BATTERY USING THE SAME

PROBLEM TO BE SOLVED: To prevent a short circuit due to insufficient functioning of a heat-resistant layer when a separator is exposed to a high temperature exceeding the melting point of a porous resin layer.SOLUTION: A separator according to the present invention includes a first inorganic heat-resistant layer and a second inorganic heat-resistant layer facing each other across a porous resin layer. Each of the first inorganic heat-resistant layer and the second inorganic heat-resistant layer is a porous layer containing inorganic particles and a binder. The first inorganic heat-resistant layer has a smaller peel strength with respect to the porous resin layer than the second inorganic heat-resistant layer.