| 摘要 |
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.SOLUTION: A cell separator comprises: a porous film having a surface whose surface roughness measured by AFM is 50 nm or less, and standard deviation of the same is 5 nm 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.SELECTED DRAWING: None |
