| 摘要 |
PROBLEM TO BE SOLVED: To provide a separator for a nonaqueous electrolyte secondary battery, capable of suppressing deterioration in battery performance due to the incorporation of metal or the like during a manufacturing process thereof.SOLUTION: A laminated separator for a nonaqueous electrolyte secondary battery includes at least a first layer and a second layer disposed on one surface of the first layer. The first layer has a porosity larger than that of the second layer, and the amount of air space larger than that of the second layer. The first layer is used so as to be disposed on a negative electrode side of the nonaqueous electrolyte secondary battery. |
