| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a polyolefin resin microporous film excellent in holding an electrolyte and capable of giving a lithium ion battery suitable for high-output application.SOLUTION: A polyolefin resin microporous film has a gas permeability of 100-400 sec/100 mL, and a ratio of outermost surface of a non-porous part where no microporous part is present in a 1μm square of 10-50%. When used in a lithium ion battery for example, the film is excellent in holding an electrolyte, hardly causing liquid shortage that leads to battery deficiency even when used at high output for a long period, and is thus suitably used.</p> |
