| abstract |
An object of the present invention is to realize a nonaqueous electrolyte battery capable of exhibiting a high energy density, a high battery voltage and an excellent lifetime characteristic, and capable of easily performing voltage management. According to one embodiment, there is provided an active material comprising a complex oxide having a quadratic crystal structure. This composite oxide is represented by the general formula Li 2 + w Na 2 - x M y y Ti 6 - z M 2 z O 14 + δ . Here, M1 is at least one selected from the group consisting of Cs and K. M2 is at least one selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Co, Mn and Al. w is in the range of 0? w? 4. x is in the range of 0 < x < 2. y is in the range of 0? y <2. z is in the range of 0 < z < ? is in the range of -0.5??? 0.5. |