SEPARATOR FOR BATTERY, AND BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a separator for a battery which is superior in liquid- holdability by treating an inexpensive nonwoven fabric of large specific surface area to impact hydrophilicity, and to provide a battery of high performance using the separator. SOLUTION: This separator is for a battery, in which a melt-blow nonwoven fabric treated with water-flow crossing treatment and having an average fabric size of 10μm or less is treated to impart hydrophilicity, in particular the hydrophilicity is preferably imparted through grafting treatment, and its ion exchanging capacity is 0.02-3 meq/g. A fabric made of the melt-blow nonwoven fabric comprises a polyolefin resin, and its optimum basis weight is 30-100 g/m<2> . The battery formed using the separator exhibits an excellent battery characteristic.