ACTIVE MATERIAL, NONAQUEOUS ELECTROLYTE BATTERY, BATTERY PACK AND VEHICLE

According to one embodiment, there is provided an active material. The active material includes a composite oxide having a monoclinic crystal structure and represented by a general formula of LiNaM1TiM2O. In the general formula, M1 is at least one metallic element selected from the group consisting of Mg, Sr, Ca, Ba, Cs and K. M2 is at least one metallic element selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Co, Mn and Al. The subscript w is within a range of 0≤w≤6. The subscript x is within a range of 0≤x