| 摘要 |
According to one embodiment, there is provided an active material. The active material contains a composite oxide represented by a following general formula: Lix(Nb1-yTay)2-zTi1+0.5zM0.5zO7,  the general formula: in which 0≦̸x≦̸5, 0≦̸y≦̸1, and 0<z≦̸1, and M is at least one metal element selected from the group consisting of Mo and W. |
