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|1. (WO2018078704) SEPARATOR AND SECONDARY BATTERY INCLUDING SEPARATOR|
|Applicants:||SUMITOMO CHEMICAL COMPANY, LIMITED
|Title:||SEPARATOR AND SECONDARY BATTERY INCLUDING SEPARATOR|
Provided are: a separator which has excellent slipping properties and machinability, and can enable a secondary battery in which the degradation of battery characteristics during repeated charging and discharging is suppressed; and a secondary battery comprising the separator. Provided are: a separator having a first layer composed of a porous polyolefin; and a secondary battery using the separator. The convergence time of the temperature rise of the first layer when impregnated with N-methyl pyrrolidone containing 3 wt% of water and then irradiated with an 1800 W-output microwave having a frequency of 2455 MHz is 2.9-5.7 s·m2/g, and when a ball having a diameter of 14.3 mm and a weight of 11.9 g is dropped to free-fall onto the first layer, the minimum drop height at which the first layer is torn by the ball is 50-150 cm.