| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery having an improved low-temperature output characteristic.SOLUTION: A nonaqueous electrolyte secondary battery 1 comprises: an electrode assembly 20; and a nonaqueous electrolyte. The electrode assembly 20 is arranged by winding a positive electrode 21, a negative electrode 22, and a separator 23. The negative electrode 22 is opposed to the positive electrode 21. The separator 23 is disposed between the positive electrode 21 and the negative electrode 22. The battery capacity is 4 Ah or larger. In the nonaqueous electrolyte secondary battery 1, the number of layers constituting the positive electrode 21 is 50 or more in a cross section including the center thereof. The capacitance ratio of the opposing positive and negative electrode is 1.1-1.4. The nonaqueous electrolyte includes lithium difluorophosphate. |
