Separator for a non-aqueous secondary battery, and non-aqueous secondary battery

Abstract

A separator for a non-aqueous secondary battery, the separator including: a porous substrate; and an adhesive porous layer provided on one or both sides of the porous substrate and including a polyvinylidene fluoride-based resin, the adhesive porous layer would exhibit a ratio of an area intensity of a β-phase-crystal-derived peak of the polyvinylidene fluoride-based resin to a sum of an area intensity of an α-phase-crystal-derived peak of the polyvinylidene fluoride-based resin and the area intensity of the β-phase-crystal-derived peak of the polyvinylidene fluoride-based resin of from 10% to 100% when an x-ray diffraction spectrum is obtained by performing measurement by an x-ray diffraction method.

What is claimed is: 
     
         1 . A separator for a non-aqueous secondary battery, the separator comprising:
 a porous substrate; and   an adhesive porous layer provided on one or both sides of the porous substrate and comprising a polyvinylidene fluoride-based resin, the adhesive porous layer would exhibit a ratio of an area intensity of a β-phase-crystal-derived peak of the polyvinylidene fluoride-based resin to a sum of an area intensity of an α-phase-crystal-derived peak of the polyvinylidene fluoride-based resin and the area intensity of the β-phase-crystal-derived peak of the polyvinylidene fluoride-based resin of from 10% to 100% when an x-ray diffraction spectrum is obtained by performing measurement by an x-ray diffraction method.   
     
     
         2 . The separator for a non-aqueous secondary battery according to  claim 1 , wherein the adhesive porous layer would exhibit the ratio of the area intensity of the β-phase-crystal-derived peak of the polyvinylidene fluoride-based resin to the sum of the area intensity of the α-phase-crystal-derived peak of the polyvinylidene fluoride-based resin and the area intensity of the β-phase-crystal-derived peak of the polyvinylidene fluoride-based resin is from 10% to 35% when the x-ray diffraction spectrum is obtained by performing measurement by the x-ray diffraction method. 
     
     
         3 . The separator for a non-aqueous secondary battery according to  claim 1 , wherein the adhesive porous layer would exhibit a half-width of an endothermic peak of from 15° C. to 30° C. when a differential scanning calorimetry curve is obtained by differential scanning calorimetry. 
     
     
         4 . The separator for a non-aqueous secondary battery according to  claim 1 , wherein the adhesive porous layer further comprises a crystal form regulator. 
     
     
         5 . The separator for a non-aqueous secondary battery according to  claim 4 , wherein the crystal form regulator is a layered clay mineral. 
     
     
         6 . The separator for a non-aqueous secondary battery according to  claim 5 , wherein the layered clay mineral comprises at least one selected from the group consisting of hectorite, saponite, stevensite, beidellite, montmorillonite, and swellable mica. 
     
     
         7 . The separator for a non-aqueous secondary battery according to  claim 5 , wherein the layered clay mineral has been treated with an intercalating agent. 
     
     
         8 . The separator for a non-aqueous secondary battery according to  claim 5 , wherein the layered clay mineral comprises an organic onium ion between layers of the layered clay minerals. 
     
     
         9 . The separator for a non-aqueous secondary battery according to  claim 5 , wherein a mass ratio of the polyvinylidene fluoride-based resin to the layered clay mineral contained in the adhesive porous layer is from 99.9:0.1 to 95.0:5.0. 
     
     
         10 . The separator for a non-aqueous secondary battery according to  claim 1 , wherein a weight of the adhesive porous layer on one side of the porous substrate is from 0.5 g/m 2  to 2.0 g/m 2 . 
     
     
         11 . The separator for a non-aqueous secondary battery according to  claim 1 , wherein a peel strength between the porous substrate and the adhesive porous layer is from 0.20 N/12 mm to 1.20 N/12 mm. 
     
     
         12 . The separator for a non-aqueous secondary battery according to  claim 1 , wherein a value obtained by subtracting a Gurley value of the porous substrate from a Gurley value of the separator for a non-aqueous secondary battery is 90 seconds/100 cc or less. 
     
     
         13 . The separator for a non-aqueous secondary battery according to  claim 1 , wherein:
 the adhesive porous layer further comprises at least one kind of particles selected from the group consisting of metal hydroxide particles and metal oxide particles; and   a content of the particles in the adhesive porous layer is 10% by mass or more but less than 80% by mass with respect to a total amount of the polyvinylidene fluoride-based resin and the particles.   
     
     
         14 . A separator for a non-aqueous secondary battery, the separator comprising:
 a porous substrate; and   an adhesive porous layer provided on one or both sides of the porous substrate and comprising a polyvinylidene fluoride-based resin and a layered clay mineral,   a weight of the adhesive porous layer on one side of the porous substrate being from 0.5 g/m 2  to 2.0 g/m 2 .   
     
     
         15 . A non-aqueous secondary battery comprising:
 a positive electrode;   a negative electrode; and   the separator for a non-aqueous secondary battery according to  claim 1 , which is disposed between the positive electrode and the negative electrode,   the non-aqueous secondary battery being configured to produce an electromotive force by lithium doping/de-doping.