| abstract |
Provided is a separator for an electrochemical device, the separator having excellent denseness, resistance, and wettability by electrolytic solutions. A separator for an electrochemical device, the separator being interposed between a pair of electrodes and being capable of holding an electrolytic solution containing an electrolyte, wherein the separator for an electrochemical device comprises solvent-spun regenerated cellulose fibers in which the core portion has an average fiber diameter of 1-11 μm, the separator having a thickness of from 5 to 100 μm, a density of from 0.25 to 0.9 g/cm 3 , and a curvature rate of from 1.5 to 15. |