| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyolefin microporous film suitable as a separator capable of providing a battery making good cycle characteristics compatible with high voltage resistant characteristics.SOLUTION: A polyolefin microporous film has: a bubble point of 500-700 kPa; a ratio of longitudinal-direction (MD) tensile strength to width-direction (TD) tensile strength of 1.0-5.5; and a shutdown temperature of 130-140°C. |
