| abstract |
PROBLEM TO BE SOLVED: To provide a battery active material having excellent productivity and excellent rapid charge / discharge performance and high energy density, a non-aqueous electrolyte battery using the active material, and a battery pack including the battery. According to an embodiment, an active material for a battery including a niobium-titanium composite oxide and an element M is provided. In the active material, the molar ratio (M / Ti) of the element M to Ti satisfies the formula (I). In the niobium-titanium composite oxide, the molar ratio of Nb to Ti (Nb / Ti) satisfies the formula (II). 0 <M / Ti ≦ 0.5 (I) 1 ≦ Nb / Ti ≦ 5 (II) The element M is at least one selected from the group consisting of B, Na, Mg, Al, Si, S, P, K, Ca, Mo, W, Cr, Mn, Co, Ni, and Fe. [Selection] Figure 3 |