Nonaqueous electrolyte secondary battery laminated body

A nonaqueous electrolyte secondary battery laminated separator comprising:

• a polyolefin porous film;
• and a porous layer which is formed one surface or both surfaces of the polyolefin porous film,
• wherein at least one of outermost surface layers of the nonaqueous electrolyte secondary battery laminated separator lies on a side of the porous layer and has adhesiveness with respect to a test electrode plate,
• the test electrode plate is a 1-mm-thick laminated body in which an electrode active material consisting of lithium nickel cobalt manganese oxide (NCM523), carbon black, graphite, and PVDF in a ratio of 92:2.5:2.5:3 is formed on an aluminum foil,
• a peel strength between the test electrode plate and the outermost surface layer of the nonaqueous electrolyte secondary battery laminated separator is lower than a peel strength between the porous layer and the polyolefin porous film, when said nonaqueous electrolyte secondary battery laminated body has been subjected to Peeling Test C under the following conditions:
• Step 1C. The nonaqueous electrolyte secondary battery laminated separator and the test electrode plate are laminated such that the porous layer and the test electrode plate face each other via the outermost surface layer having adhesiveness with respect to the test electrode plate, and pressing is performed under the conditions of 70° C., 6 MPa, and 10 seconds to prepare a test laminated body;
• Step 2C. The test laminated body is immersed, at 60° C. for 24 hours, in a solvent of ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate in a volume ratio of 30:35:35;
• Step 3C. The test electrode plate is fixed on a substrate;
• and
• Step 4C. The nonaqueous electrolyte secondary battery laminated separator is peeled off at a peeling speed of 100 mm/min so that an angle between the test electrode plate and the nonaqueous electrolyte secondary battery laminated separator is 180°.