| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery in which the impregnation property of a positive electrode mixture layer is enhanced in the central part thereof in the winding axis direction, and superior battery performance is ensured by preventing outflow of nonaqueous electrolyte from the positive electrode mixture layer during charge/discharge.SOLUTION: In the nonaqueous electrolyte secondary battery, both ends 66A, 66A of a positive electrode mixture layer 66 in the winding axis direction of a wound electrode are mainly composed of a first positive electrode material 68A, and the central part 66B including at least the center of the positive electrode mixture layer 66 in the winding axis direction is mainly composed of a second positive electrode material 68B. The amount of DBP absorption (mL/100 g) is different from each other between the first positive electrode material and second positive electrode material, and the amount of DBP absorption A(mL/100 g) of the first positive electrode material is smaller than the amount of DBP absorption B(mL/100 g) of the second positive electrode material. |
