| abstract |
A battery separator having cellulosic fibers with improved resistance to an alkaline solution. SOLUTION: Cellulose fibers of lyocells are included, and the R10 value, R18 value and hemicellulose content of lyocell fibers are R10> 83%, preferably> 84%, more preferably> 89% and R18> 93%, A battery separator, preferably> 94%, more preferably> 97% and hemicellulose content <3%, more preferably <2%. The battery separator is preferably mercerized with lyocell fibers, and preferably exhibits a weight loss in KOH of 6% or less, and preferably has a fragile aeration rate of less than 50 cm3 / cm2 / s. [Selection] Figure 1 |