| abstract |
Provides separators for electrochemical devices that are excellent in density, electrical resistance, and wettability of electrolyte. A separator for an electrochemical element is configured as a separator for an electrochemical element that is interposed between a pair of electrodes and capable of holding an electrolytic solution containing an electrolyte, wherein the separator for an electrochemical element is determined by the average fiber diameter of the core portion It is composed of solvent-spun regenerated cellulose fibers of 1-11 μm, with a thickness of 5-100 μm, a density of 0.25-0.9 g/cm 3 , and a curvature of 1.5-15. |