abstract |
According to one embodiment, an active material is provided. This active material is represented by the general formula of Li (2+x) Na 2 Ti 6 O 14 , wherein x is within a range of 0≦x≦6. The active material includes at least one element selected from the group consisting of Zr, Mo, W, V, Nb, Ta, P, Y, Al, Fe, and B in a content of 0.03 to 8.33 atom %. |