| abstract |
A battery separator excellent in alkali resistance, separation property, and electrolyte solution absorption property, and a method for producing the same are provided. SOLUTION: The battery surface layer is made of cellulose, and includes a cellulosic ultrafine fiber having a single yarn fineness of 0.05 to 0.8 dtex, and the cellulosic ultrafine fiber has a micropore in the surface layer of the fiber. The separator is a method for producing a battery separator in which a cellulose ester ultrafine fiber comprising cellulose acetate propionate and / or cellulose acetate butyrate is alkali saponified and then made into a nonwoven fabric containing the ultrafine fiber. [Selection figure] None |