| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a separator for a battery which is excellent in heat resistance and has electrode isolation performance and whose internal resistance is reduced.SOLUTION: Disclosed is a separator for a battery which is formed by laminating a polyolefin microporous film and a polyester nonwoven fabric. The polyester nonwoven fabric is made of a stretched fine fiber and an unstretched fine fiber. The fiber diameter of the stretched fine fiber and the fiber diameter of the unstretched fine fiber are 0.80 to 2.00. The content of the non-unstretched fine fiber is 30 mass% or less.</p> |
