摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery in which discharge of a nonaqueous electrolyte from a wound electrode body is suppressed when high-rate charge/discharge is performed.SOLUTION: There is provided a nonaqueous electrolyte secondary battery 1 comprising a wound electrode body 20 and a nonaqueous electrolyte. At least one of a positive electrode 30 and a negative electrode 40 of the nonaqueous electrolyte secondary battery 1 comprises active material layers 34, 44 containing an active material, a conductive material and a binder on long collectors 32, 42. The active material layers 34, 44 are divided into first and second end portions b1 and b2 in a length direction at both ends in a width direction and a central portion (a) that is held between the first and second end portions. When a DBP oil absorption amount of the conductive material contained in the central portion (a) is defined as A (ml/100 g) and a DBP oil absorption amount of the conductive material contained in the first and second end portions b1 and b2 is defined as B (ml/100 g), A and B satisfy an expression of 100≤B<A≤450.SELECTED DRAWING: Figure 3 |