| 摘要 |
According to one embodiment, there is provided a positive electrode (6) including a positive electrode active material-including layer (62) including a positive electrode active material, which includes a lithiummanganese oxide LiMn 2-x M x O 4 , and a conductive agent. In the positive electrode active material-including layer (62), an average particle diameter d 50 is within 2 µm to 5 µm, a particle diameter d 10 and a particle diameter d 90 , where a cumulative frequency from a smaller side is, respectively, 10% and 90%, is within 0.5 µm to 3 µm and within 4 µm to 10 µm, respectively, in a particle size distribution. X, represented by X = (d 50 - d 10 ) /d 50 is within 0.4 to 0.8. Y, represented by Y = (d 90 - d 50 )/d 90 is within 0.2 to 0.6. |
