| abstract |
An object of the present invention is to provide a separator capable of eliminating adverse effects due to static electricity and improving battery characteristics in addition to heat resistance and shutdown characteristics. A separator for a non-aqueous secondary battery in which a heat-resistant porous layer is coated on one side or both sides of a polyolefin microporous membrane, the separator having an equilibrium water content at a temperature of 20 ° C. and a relative humidity of 40%. 0.01 to 0.5 g / m 2, and a nonaqueous secondary battery separator characterized by containing the water 0.005~0.1g / m 2. [Selection figure] None |