| 摘要 |
PROBLEM TO BE SOLVED: To obtain a microporous polyethylene film having a good permeability and high strengths, and especially suitable for separators of a lithium ion secondary battery. SOLUTION: This microporous polyethylene film has 40-60% of porosity, 300-1500 g of thrust strength (expressed in terms of 25μm), 0.1-0.3μm average pore size, 1.40->=2.2 pore size-distribution index and 0.4-1.0Ωcm2 electric resistance. |
