According to the third embodiment, since the nonaqueous electrolyte battery of the second embodiment is included, there can be provided a battery pack having a high capacity and excellent rate performance.
Hereinafter, Examples will be described.
A niobium titanium composite oxide was synthesized by a solid reaction method. In order to obtain an Nb rich phase, Nb2O5 particles having an average particle diameter of 0.7 μm and TiO2 particles having an average particle diameter of 4.5 μm were used as starting materials. As the average particle diameters of Nb2O5 particles and TiO2 particles, particle diameters when the volume frequency measured with a laser diffraction and scattering-type particle size distribution measuring device (Microtrac MT33-EXII, Nikkiso Co., Ltd.) was 50% were used.