| abstract |
To provide a battery active material capable of realizing a nonaqueous electrolyte battery capable of exhibiting a high charge / discharge capacity, a high battery voltage, and excellent life characteristics. According to one embodiment, an active material for a battery including a composite oxide having a monoclinic crystal structure is provided. This composite oxide is represented by the general formula LiwNa4-xM1yTi6-zM2zO14 + δ. Here, M1 is at least one element selected from the group consisting of Rb, Cs, K and H. M2 is at least one metal element selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Co, Mn, and Al. w is in the range of 0 ≦ w <12. x is in the range of 0 <x <4. y is in the range of 0 ≦ y <2. z is in the range of 0 <z <6. δ is in the range of −0.3 ≦ δ ≦ 0.3. [Selection] Figure 1 |