CPC H01M 10/0525 (2013.01) [H01M 50/403 (2021.01); H01M 50/406 (2021.01); H01M 50/417 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01)] | 15 Claims |
1. A polyolefin microporous membrane having a puncture elongation of not more than 2.30 mm, a temperature at a stress inflection point of not less than 80.0° C., and a stress peak value of not more than 1.8 g in thermomechanical analysis (TMA) measurement of a transverse direction of the polyolefin microporous membrane, wherein the polyolefin microporous membrane is a single layer excluding an inorganic coating layer at a measurement of the puncture elongation and the TMA measurement performed in constant length mode.
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