Active material, electrode, secondary battery, battery pack, and vehicle

Abstract

According to one embodiment, an active material is provided. The active material includes an Nb2TiO7 phase and at least one Nb-rich phase selected from the group consisting of an Nb10Ti2O29 phase, an Nb14TiO37 phase, and an Nb24TiO64 phase. The active material satisfies a peak intensity ratio represented by the following Formula (1). 0<IB/IA≤0.25  (1) In Formula (1), IA is a peak intensity of the maximum peak attributed to the Nb2TiO7 phase and appearing at 2θ of 26.0±0.1° in a wide angle X-ray diffraction pattern under CuKα rays as an X-ray source. IB is a peak intensity of the maximum peak attributed to the at least one Nb-rich phase and appearing at 2θ of 24.9±0.2° in the diffraction pattern.

Dependencies are inferred from the claim text.