| 摘要 |
PROBLEM TO BE SOLVED: To provide a separator for a battery, the separator having an excellent durability against a charge and discharge cycle under a condition of a high upper limit voltage, and to provide a nonaqueous electrolyte secondary battery equipped with the separator.SOLUTION: The nonaqueous electrolyte secondary battery 10 including a separator 13 interposed between a positive electrode 12 and a negative electrode 14 is provided. The separator 13 includes a porous film containing a polymer having an acyl group (for example, polyimide) as a main component, and BFis bonded to the polymer. |
