ACTIVE MATERIAL FOR BATTERY, NONAQUEOUS ELECTROLYTE BATTERY, AND BATTERY PACK

An active material for batteries includes a titanium composite oxide, wherein the titanium composite oxide comprises a monoclinic ²-type titanium composite oxide as a main phase, and when an integral intensity of the main peak of the monoclinic ²-type titanium composite oxide obtained with a wideangle X-ray diffraction method having a CuK±-ray as an X-ray source is 100, the relative value of the integral intensity of the main peak that presents the range of 2¸=25.1 to 25.5° attributed to at least one sub-phase selected from anatase-type TiO 2 and H 2 Ti 8 O 17 is 30 or less, and the titanium composite oxide has a crystallite diameter of 5 nm or more as calculated from the main peak of the monoclinic ²-type titanium composite oxide obtained with the wideangle X-ray diffraction method. The active material has a high capacity and excellent large-current performance.