BATTERY ACTIVE MATERIAL, NONAQUEOUS ELECTROLYTE BATTERY, AND BATTERY PACK

摘要

PROBLEM TO BE SOLVED: To provide: a battery active material having excellent rapid charge/discharge performance and high energy density; a nonaqueous electrolyte battery; and a battery pack.SOLUTION: According to an embodiment, there is provided a battery active material including a complex oxide containing niobium and titanium. A ratio M/Mof the mol number Mof niobium with respect to the mol number of Mof titanium in the active material satisfies one of the following expressions (I) and (II). 0.5≤M/M<2 (I) and 2