| abstract |
The cross-sectional crystal orientation of the power storage device separator is 0.85 or more, and/or the production method of the power storage device separator includes a temperature of 20°C to 70°C, a shear rate of 100 to 400,000 seconds -1 , and a residence time of 1.0 to 60 seconds A process of preparing a mixed slurry by mixing a polyolefin powder containing polyethylene and a plasticizer using a continuous mixer under the conditions of, a process of extruding the mixed slurry and cooling and solidifying it to form a sheet-like molded body, and a sheet-like molded body 20 It includes a step of biaxially stretching at a surface magnification of 2 times to 200 times. |