| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cell separator, having both a shutdown function and a heat-resistant shape holding function, and having high uniformity in film thickness and air permeability. <P>SOLUTION: Provided is the cell separator, comprising: a porous film having a surface whose surface roughness measured by AFM is 50nm or less, and a standard deviation of the same is 5nm or less; and a heat-resistant layer, formed at least on one surface of the porous film, and containing heat resistant fine particles as a main component. <P>COPYRIGHT: (C)2013,JPO&INPIT |
