POLYOLEFIN MICROPOROUS MEMBRANE, METHOD FOR MANUFACTURING A POLYOLEFIN MICROPOROUS MEMBRANE, AND SEPARATOR FOR A LITHIUM ION BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a modified polyolefin microporous membrane suitable as separators for lithium ion batteries, precision filter membranes, separators for capacitors, fuel cell materials, etc.;SOLUTION: A heat-resistant porous layer consisting of the following organic silicone particulates and an organic binder is formed on one surface or both surfaces of a polyolefin microporous membrane: organic silicone particulates: organic silicone particulates consisting of a polysiloxane crosslinked structure in which an overall hollow hemispherical contour formed, on a longitudinal sectional representation, by inner lesser minor arcs 11, outer greater minor arcs 21 covering the former, and ridge lines 31 spanning the respective ends of both is manifest in a state where the average value of widths between the respective ends of inner lesser minor arcs 11 (W₁), the average value of widths between the respective ends of outer greater minor arcs 21 (W₂), and the average value of heights of outer greater minor arcs 21 (H) are being confined respectively to ranges of 0.01-8 μm, 0.05-10 μm, and 0.015-8 μm.;COPYRIGHT: (C)2014,JPO&INPIT