| 摘要 |
The present invention relates to a porous membrane including cellulose fibers, wherein the cellulose fibers are obtained from a mixture of: more than 50% by weight of (1) first raw material cellulose fibers having a surface area determined by congo red coloring of 250 m 2 /g or more and 500 m 2 /g or less; and less than 50% by weight of (2) second raw material cellulose fibers having a surface area determined by congo red coloring of 150 m 2 /g or more and less than 250 m 2 /g. The porous membrane according to the present invention can provide a separator for electrochemical devices with superior properties, at a reasonable cost. |
