| 摘要 |
This separator for a non-aqueous electrolyte cell comprises a heat-resistant porous layer on at least one side of a resin porous membrane the primary component of which is a polyolefin having a melting temperature of 80 to 180ºC, and has the resin at the ratio of 50 to 99.9 vol% in the total volume of the structural components of the separator. The heat-resistant porous layer comprises heat-resistant microparticles, a binder, and expandable microparticles that expand in the nonaqueous electrolyte as a result of increased absorbtion of nonaqueous electrolyte when heated. The volume percentage of the expandable microparticles and heat-resistant microparticles is 10:90 to 95:5. The heat-resistant porous layer is characterized as follows: by containing a polymer, as the binder, which has groups having a cyclic structure comprising amide bonds and a skeleton derived from polymerizable double bonds, has a glass transition temperature of 130ºC or higher, and has a weight-average molecular weight of 350,000 or greater; in that the polymer content of the heat-resistant porous layer is 0.1 parts by mass or greater if the total amount of expandable microparticles and heat-resistant microparticles is 100 parts by mass; and in that the heat-resistant porous layer thickness is between 2 and 10 µm. |
